HighCVE-2026-48526

Jpadilla Pyjwt: Improper Verification of Cryptographic Signature (CVE-2026-48526)

Published 28.05.2026Last modified 26.10.2026Sources: Red Hat, BSI, CVE.org, SUSE, OSV, Ubuntu, Msrc Update Guide, EUVD

Public exploit

What is affected, what to do

An exploit is publicly available. Update Jpadilla Pyjwt to version 2.13.0.

Affected: Jpadilla Pyjwt lt *..2.13.0
Fixed in: Jpadilla Pyjwt 2.13.0

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.4

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.4

CVSS v3

Severity High on the scale from 0 to 10.

Source: Red Hat, BSI, CVE.org, SUSE, OSV, Ubuntu, Msrc Update Guide, EUVD

0.4 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 37.0

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: 65.92 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: PoC (publicly reported)
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: 7.4 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: 7.4
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: 0.4 %; 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: 37.0; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: 28.05.2026
CISA assessment (SSVC): Exploitation: proof of concept · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 29 May 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-287, CWE-347, CWE-347

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

A flaw was found in PyJWT, a Python library for JSON Web Token (JWT) implementation. When decoding JWTs, the library fails to validate the use of JSON Web Keys (JWK) in the HMAC algorithm while also supporting asymmetric algorithms. This allows a remote attacker to use the issuer's public key as the secret key for the HMAC algorithm, leading to the ability to forge JWTs. This vulnerability can result in authentication bypass or unauthorized access.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, NVD (NIST), suse_csaf, OSV (Open Source Vulnerabilities), cvelistv5, CVE.org (MITRE), Ubuntu Security Notices, Microsoft Security Update Guide, ENISA EUVD

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
jpadilla	pyjwt	`< 2.13.0`	`2.13.0`
pyjwt_project	pyjwt	`< 2.13.0`	`2.13.0`

Vendors and products

Affected operating systems

Affected operating systems

Linux	ubuntu	pyjwt	`bionic`
Linux	ubuntu	pyjwt	`focal`
Linux	ubuntu	pyjwt	`jammy`
Linux	ubuntu	pyjwt	`noble`
Linux	ubuntu	pyjwt	`resolute`
Linux	ubuntu	pyjwt	`xenial`

Weakness classes (CWE)

CWE-287Improper Authentication
Class
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Entry at MITRE CWE-287
CWE-347Improper Verification of Cryptographic Signature
Base
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Entry at MITRE CWE-347
CWE-347Improper Verification of Cryptographic Signature
Base
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Entry at MITRE CWE-347

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

Reference tagged as exploit	github.com (opens in a new tab)	PoC (publicly reported)reported, not verified	—

References & sources

github.comjpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wxevidence, x_refsource_CONFIRM, Exploit, Vendor advisory
access.redhat.comsecurity/cve/CVE-2026-48526Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2482734Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-48526.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:50319Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:50223Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:50336Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34160Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:50222Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:50263Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34365Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35845Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:25902Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35837Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35836Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35835Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:26206Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:30089Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:30088Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:42144Vendor advisory, x_refsource_REDHAT

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).

10.09.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/48xxx/CVE-2026-48526.json">CVE-2026-48526</a>

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

28.08.2026Record modifiedGitHub

New references:

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx
Reference	removed	https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx	—
Reference type	removed	https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx Types: Exploit, Vendor Advisory	—

Source identifier: security-advisories@github.com

28.08.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 74 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/48xxx/CVE-2026-48526.json">CVE-2026-48526</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:25902
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:25928
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:26206
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:28571
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:30076
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:30088
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:30089
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:33683
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34160
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34365
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:34374
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35835
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35836
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35837
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35845
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36350
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:37275
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:40967
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:41066
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42132
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42144
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42644
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42796
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:43038
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:48085
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50222
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50223
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50263
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50319
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50336
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50340
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50904
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:60520
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-48526
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2482734
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48526.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:25902	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:25928	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:26206	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:28571	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:30076	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:30088	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:30089	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:33683	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34160	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34365	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:34374	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35835	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35836	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35837	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35845	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36350	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:37275	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:40967	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:41066	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:42132	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:42142	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:42144	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:42644	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:42796	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:43038	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:48085	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50222	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50223	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50263	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50319	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50336	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50340	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:50904	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-48526	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2482734	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48526.json	—

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

06.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:50904

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50904
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9 (+94)	Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9 (+94)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

05.08.2026Record modifiedRed Hat ADP

New references:

and 2 more references

Show 7 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50222
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50223
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50263
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50319
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50336
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:50340
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+89)	Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9 (+94)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Show 7 older changes

30.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:48085

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:48085
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+89)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

28.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

23.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

22.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42796
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:43038
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+87)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+88)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

21.07.2026Record modifiedRed Hat ADP

New references:

Show 5 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42132
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42144
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:42644
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+85)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+87)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

20.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+85)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+85)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

06.07.2026Record modifiedRed Hat ADP

New references:

Show 5 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35835
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35836
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35837
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35845
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Satellite 6.19 for RHEL 9, Red Hat Enterprise Linux AppStream (v. 10) (+18)	Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Satellite 6.19 for RHEL 9, Red Hat Enterprise Linux AppStream EUS (v. 10.0) (+26)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-48526"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-48526.svg?lang=en" alt="CVE-2026-48526 – NEOSEC Intel" height="20"></a>