httpc leaks Authorization header to cross-origin redirect targets (CVE-2026-48856)
Published Last modified Sources: SUSE, Debian, BSI, OSV, Msrc Update Guide, CVE.org
What is affected, what to do
Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim.
Update erlang\/inets to version 9.6.2.2, erlang\/otp to version 27.3.4.13, Erlang/OTP to version 29.0.2.
- Affected
- Erlang OTP
gte 17.0..* - Erlang OTP
gte 5.10..*
- Erlang OTP
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Metrics
7.1
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v4
6.5
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: SUSE, Debian, BSI, OSV, Msrc Update Guide, CVE.org
0.3 %
EPSS score
Low — model estimates < 1% exploitation likelihood.
Source: FIRST EPSS, percentile 26.9
Show all metrics
- Severity
- High
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 59.98 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 7.1 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 6.5
CVSS v4
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 7.1
EPSS score
The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.
Read in glossary- 0.3 %
- Low — model estimates < 1% exploitation likelihood.
EPSS percentile
The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.
Read in glossary- 26.9
- Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
- CISA assessment (SSVC)
- Exploitation: none known · not automatable · Technical impact: partial
- Source: CISA Vulnrichment, as of 10 June 2026
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-601
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.19, OTP 28.5.0.8, and OTP 29.1.2, corresponding to inets from 5.10 before 9.3.2.8, 9.6.2.4, and 9.8.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Source: suse_csaf, Debian Security Advisories, BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), Microsoft Security Update Guide, NVD (NIST), cvelistv5, CVE.org (MITRE)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Erlang | OTP |
|
|
| erlang | erlang\/inets |
|
|
| erlang | erlang\/otp |
|
|
| Open Source | Erlang/OTP |
|
|
| Open Source | Erlang/OTP erl_interface |
|
|
| Open Source | Erlang/OTP erts |
|
|
| Open Source | Erlang/OTP ftp |
|
|
| Open Source | Erlang/OTP inets |
|
|
| Open Source | Erlang/OTP ssh |
|
|
Vendors and products
Affected operating systems
| Linux | debian | erlang | trixie |
Weakness classes (CWE)
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
Base
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
Entry at MITRE CWE-601
References & sources
- github.comGitHub Advisoryadvisory, related, Vendor advisory, Mitigation, Vendor advisory
- cna.erlef.orgEEF CNA record for CVE-2026-48856web, related, Mitigation, Third-party advisory
- erlang.orgErlang/OTP version orderingweb, x_version-scheme, Product
- github.comerlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612fix
- OSV (Open Source Vulnerabilities)OSV record EEF-CVE-2026-48856related, Mitigation, Third-party advisory
- github.comFix commit f78fae9 in erlang/otpfix, Patch
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
Record modifiedEEF
Description added or changed
Show 5 original changes
Individual changes of this event as published by NVD Type Action Before After Description changed Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to inets from 5.10 before 9.3.2.6, 9.6.2.2, and 9.7.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.19, OTP 28.5.0.8, and OTP 29.1.2, corresponding to inets from 5.10 before 9.3.2.8, 9.6.2.4, and 9.8.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/48xxx/CVE-2026-48856.json">CVE-2026-48856</a>Reference added —https://github.com/erlang/otp/commit/f78fae9294886f95545a2212671282eda230def1Reference removed https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612—Reference type removed https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612 Types: Patch—Source identifier: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Record modifiedEEF
Description added or changed
Show 17 original changes
Individual changes of this event as published by NVD Type Action Before After Description changed Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 29.0.2, OTP 28.5.0.2 and OTP 27.3.4.13, corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to inets from 5.10 before 9.3.2.6, 9.6.2.2, and 9.7.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.Affected versions (publisher) added —Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/48xxx/CVE-2026-48856.json">CVE-2026-48856</a>Reference added —https://cna.erlef.org/cves/CVE-2026-48856.htmlReference added —https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612Reference added —https://github.com/erlang/otp/security/advisories/GHSA-m75x-4vwg-ggjhReference added —https://osv.dev/vulnerability/EEF-CVE-2026-48856Reference added —https://www.erlang.org/doc/system/versions.html#order-of-versionsReference removed https://cna.erlef.org/cves/CVE-2026-48856.html—Reference removed https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612—Reference removed https://github.com/erlang/otp/security/advisories/GHSA-m75x-4vwg-ggjh—Reference removed https://osv.dev/vulnerability/EEF-CVE-2026-48856—Reference removed https://www.erlang.org/doc/system/versions.html#order-of-versions—Reference type removed https://cna.erlef.org/cves/CVE-2026-48856.html Types: Mitigation, Third Party Advisory—Reference type removed https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612 Types: Patch—Reference type removed https://github.com/erlang/otp/security/advisories/GHSA-m75x-4vwg-ggjh Types: Mitigation, Vendor Advisory—Reference type removed https://osv.dev/vulnerability/EEF-CVE-2026-48856 Types: Mitigation, Third Party Advisory—Reference type removed https://www.erlang.org/doc/system/versions.html#order-of-versions Types: Product—Source identifier: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Record modifiedEEF
Description added or changed
Show the original change
Individual changes of this event as published by NVD Type Action Before After Description changed Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from OTP 17.0 before OTP 29.0.2, OTP 28.5.0.2 and OTP 27.3.4.13, corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.Source identifier: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Initial analysis by NVDNVD
Newly listed as affected:- erlang/otp (17.0 – before 27.3.4.13; 28.0 – before 28.5.0.2; 29.0 – before 29.0.2)
- erlang/inets (5.10 – before 9.3.2.6; 9.6 – before 9.6.2.2; 9.7 – before 9.7.1)
CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Show 7 original changes
Individual changes of this event as published by NVD Type Action Before After CVSS added —AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NProduct configuration added —OR *cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:* versions from (including) 17.0 up to (excluding) 27.3.4.13 *cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:* versions from (including) 28.0 up to (excluding) 28.5.0.2 *cpe:2.3:a:erlang:erlang/otp:*:*:*:*:*:*:*:* versions from (including) 29.0 up to (excluding) 29.0.2 *cpe:2.3:a:erlang:erlang/inets:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (excluding) 9.3.2.6 *cpe:2.3:a:erlang:erlang/inets:*:*:*:*:*:*:*:* versions from (including) 9.6 up to (excluding) 9.6.2.2 *cpe:2.3:a:erlang:erlang/inets:*:*:*:*:*:*:*:* versions from (including) 9.7 up to (excluding) 9.7.1Reference type added —EEF: https://cna.erlef.org/cves/CVE-2026-48856.html Types: Mitigation, Third Party AdvisoryReference type added —EEF: https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612 Types: PatchReference type added —EEF: https://github.com/erlang/otp/security/advisories/GHSA-m75x-4vwg-ggjh Types: Mitigation, Vendor AdvisoryReference type added —EEF: https://osv.dev/vulnerability/EEF-CVE-2026-48856 Types: Mitigation, Third Party AdvisoryReference type added —EEF: https://www.erlang.org/doc/system/versions.html#order-of-versions Types: ProductSource identifier: nvd@nist.gov
ReceivedEEF
CVSS V4.0: AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness type: CWE-601
Description added or changed
Show 8 original changes
Individual changes of this event as published by NVD Type Action Before After Description added —Sensitive Data Exposure vulnerability in Erlang OTP inets (httpc_response module) allows Retrieve Embedded Sensitive Data. The httpc client forwards the Authorization and Proxy-Authorization request headers to redirect targets without checking whether the redirect crosses an origin boundary. httpc_response:redirect/2 constructs the redirected request by updating only the host field of the header record; all other fields (including authorization and proxy_authorization) are copied verbatim. The redirect target host is never compared against the original host. autoredirect defaults to true, so this affects all httpc callers that do not explicitly disable automatic redirects. An attacker who controls a server that the victim contacts via httpc can issue a cross-origin 3xx redirect to a server they also control. The Authorization header (including Basic credentials derived from URL userinfo via httpc_request:handle_user_info/2) is forwarded to the redirect target, allowing credential theft. The same applies to the Proxy-Authorization header. This vulnerability is associated with program files lib/inets/src/http_client/httpc_response.erl. This issue affects OTP from 17.0 before 29.0.2, 28.5.0.2 and 27.3.4.13 corresponding to inets from 5.10 before 9.7.1, 9.6.2.2 and 9.3.2.6.CVSS added —AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XWeakness type (CWE) added —CWE-601Reference added —https://cna.erlef.org/cves/CVE-2026-48856.htmlReference added —https://github.com/erlang/otp/commit/688d748d6f7a6a06b13b662a1d3de8af97079612Reference added —https://github.com/erlang/otp/security/advisories/GHSA-m75x-4vwg-ggjhReference added —https://osv.dev/vulnerability/EEF-CVE-2026-48856Reference added —https://www.erlang.org/doc/system/versions.html#order-of-versionsSource identifier: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
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