Samba: samba: remote code execution in printing subsystem via unescaped job description (CVE-2026-4480)
Published Last modified Sources: SUSE, CVE.org, Red Hat, EUVD, Ubuntu, Debian, Debian LTS, BSI
- Actively exploited
- Source: VulnCheck KEV (opens in a new tab) How we classify
- Public exploit
What is affected, what to do
A flaw was found in the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the "print command" setting via the "%J" substitution character without escaping shell meta characters.
The vulnerability is being actively exploited; treat it as a priority. Update Red Hat Enterprise Linux 10 to version 0:4.23.5-109.el10_2, Red Hat Enterprise Linux 10.0 Extended Update Support to version 0:4.21.3-114.el10_0.1, Red Hat Enterprise Linux 7 Extended Lifecycle Support to version 0:4.10.16-26.el7_9.1.
- Affected
- Red Hat Enterprise Linux 10
lt *..0:4.23.5-109.el10_2 - Red Hat Enterprise Linux 10.0 Extended Update Support
lt *..0:4.21.3-114.el10_0.1 - Red Hat Enterprise Linux 7 Extended Lifecycle Support
lt *..0:4.10.16-26.el7_9.1 - Red Hat Enterprise Linux 8
lt *..0:4.19.4-16.el8_10 - Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
lt *..0:4.13.3-12.el8_4.1 - Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
lt *..0:4.13.3-12.el8_4.1 - Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
lt *..0:4.15.5-16.el8_6.1 - Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
lt *..0:4.15.5-16.el8_6.1 - Red Hat Enterprise Linux 8.8 Telecommunications Update Service
lt *..0:4.17.5-7.el8_8.1 - Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
lt *..0:4.17.5-7.el8_8.1 - Red Hat Enterprise Linux 9
lt *..0:4.23.5-10.el9_8 - Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
lt *..0:4.17.5-105.el9_2.5 - Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
lt *..0:4.19.4-105.el9_4.4 - Red Hat Enterprise Linux 9.6 Extended Update Support
lt *..0:4.21.3-14.el9_6.1
- Red Hat Enterprise Linux 10
- Fixed in
- Red Hat Enterprise Linux 10
0:4.23.5-109.el10_2 - Red Hat Enterprise Linux 10.0 Extended Update Support
0:4.21.3-114.el10_0.1 - Red Hat Enterprise Linux 7 Extended Lifecycle Support
0:4.10.16-26.el7_9.1 - Red Hat Enterprise Linux 8
0:4.19.4-16.el8_10 - Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:4.13.3-12.el8_4.1 - Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:4.13.3-12.el8_4.1 - Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:4.15.5-16.el8_6.1 - Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
0:4.15.5-16.el8_6.1 - Red Hat Enterprise Linux 8.8 Telecommunications Update Service
0:4.17.5-7.el8_8.1 - Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
0:4.17.5-7.el8_8.1 - Red Hat Enterprise Linux 9
0:4.23.5-10.el9_8 - Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
0:4.17.5-105.el9_2.5 - Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
0:4.19.4-105.el9_4.4 - Red Hat Enterprise Linux 9.6 Extended Update Support
0:4.21.3-14.el9_6.1
- Red Hat Enterprise Linux 10
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Metrics
9.0
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: NVD, CVSS v3
9.0
CVSS v3
Severity Critical on the scale from 0 to 10.
Source: SUSE, CVE.org, Red Hat, EUVD, Ubuntu, Debian, Debian LTS, BSI
13.9 %
EPSS score
Elevated — model estimates 10-50% exploitation likelihood.
Source: FIRST EPSS, percentile 96.5
Show all metrics
- Severity
- Critical
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- 137.52 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- actively exploitedSource: VulnCheck KEV (opens in a new tab) How we classify
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- 9.0 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- 9.0
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- 13.9 %
- Elevated — model estimates 10-50% 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- 96.5
- Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
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: total
- Source: CISA Vulnrichment, as of 26 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-78
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- Actively exploited: treat the vulnerability as a priority in vulnerability handling under Art. 21(2)(e) NIS2. If it is exploited in your environment, check the reporting obligation under Art. 23 (early warning within 24 hours).
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- Since 11.09.2026, manufacturers of affected products with digital elements must report actively exploited vulnerabilities under Art. 14 CRA, with an early warning within 24 hours via ENISA's single reporting platform.
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 the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the "print command" setting via the "%J" substitution character without escaping shell meta characters. A remote attacker could exploit this vulnerability by sending a specially crafted print job description that contains unescaped shell characters. This could lead to remote code execution on the affected system.
Source: suse_csaf, cvelistv5, NVD (NIST), redhat_csaf, ENISA EUVD, Ubuntu Security Notices, Debian Security Advisories, CVE.org (MITRE), Debian LTS Advisories, BSI WID Portal, BSI CSAF
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
|
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
|
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
|
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
|
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
|
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
|
|
| redhat | openshift_container_platform |
|
|
| samba | samba |
|
|
| Open Source | Samba |
|
|
Vendors and products
- Debian Samba
- Open Source Samba
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Red Hat Enterprise Linux 6
- Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-life Add-on
- Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
- Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-life Add-on
- Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
Affected operating systems
| Linux | redhat | enterprise_linux | 10.0 |
| Linux | redhat | enterprise_linux | 7.0 |
| Linux | redhat | enterprise_linux | 8.0 |
| Linux | redhat | enterprise_linux | 9.0 |
| Linux | debian | samba | bookworm |
| Linux | debian | samba | bullseye |
| Linux | debian | samba | trixie |
Weakness classes (CWE)
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Base
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
Entry at MITRE CWE-78
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.
| PoC-in-GitHub (nomi-sec) | CVE-2026-4480-samba-print-command-injection-rce (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | Abducted-HTB-Writeup (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | HTB-Abducted-Writeup (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | CVE-2026-4480-exploit-poc (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | CVE-2026-4480 (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | CVE-2026-4480 (opens in a new tab)github.com | PoC (publicly reported)reported, not verified | |
| PoC-in-GitHub (nomi-sec) | CVE-2026-4480 (opens in a new tab)github.com | PoC (publicly reported)reported, not verified |
References & sources
- access.redhat.comsecurity/cve/CVE-2026-4480euvd, Vulnerability database, x_refsource_REDHAT
- bugzilla.redhat.comRHBZ#2452232euvd, Issue tracking, x_refsource_REDHAT
- bugzilla.samba.orgshow_bug.cgi?id=16033euvd
- access.redhat.comRHSA-2026:22644Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:22963Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:25049Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:25979Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28053Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28054Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28055Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28056Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28057Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28058Vendor advisory, x_refsource_REDHAT
- access.redhat.comRHSA-2026:28132Vendor advisory, x_refsource_REDHAT
- security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-4480.jsonx_sadp-csaf-vex
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 modifiedRed Hat
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/2026/4xxx/CVE-2026-4480.json">CVE-2026-4480</a>Source identifier: secalert@redhat.com
Record modifiedRed Hat
Show 32 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/2026/4xxx/CVE-2026-4480.json">CVE-2026-4480</a>Reference added —https://access.redhat.com/errata/RHSA-2026:22644Reference added —https://access.redhat.com/errata/RHSA-2026:22963Reference added —https://access.redhat.com/errata/RHSA-2026:25049Reference added —https://access.redhat.com/errata/RHSA-2026:25979Reference added —https://access.redhat.com/errata/RHSA-2026:28053Reference added —https://access.redhat.com/errata/RHSA-2026:28054Reference added —https://access.redhat.com/errata/RHSA-2026:28055Reference added —https://access.redhat.com/errata/RHSA-2026:28056Reference added —https://access.redhat.com/errata/RHSA-2026:28057Reference added —https://access.redhat.com/errata/RHSA-2026:28058Reference added —https://access.redhat.com/errata/RHSA-2026:28132Reference added —https://access.redhat.com/security/cve/CVE-2026-4480Reference added —https://bugzilla.redhat.com/show_bug.cgi?id=2452232Reference added —https://bugzilla.samba.org/show_bug.cgi?id=16033Reference removed https://access.redhat.com/errata/RHSA-2026:22644—Reference removed https://access.redhat.com/errata/RHSA-2026:22963—Reference removed https://access.redhat.com/errata/RHSA-2026:25049—Reference removed https://access.redhat.com/errata/RHSA-2026:25979—Reference removed https://access.redhat.com/errata/RHSA-2026:28053—Reference removed https://access.redhat.com/errata/RHSA-2026:28054—Reference removed https://access.redhat.com/errata/RHSA-2026:28055—Reference removed https://access.redhat.com/errata/RHSA-2026:28056—Reference removed https://access.redhat.com/errata/RHSA-2026:28057—Reference removed https://access.redhat.com/errata/RHSA-2026:28058—Reference removed https://access.redhat.com/errata/RHSA-2026:28132—Reference removed https://access.redhat.com/security/cve/CVE-2026-4480—Reference removed https://bugzilla.redhat.com/show_bug.cgi?id=2452232—Reference removed https://bugzilla.samba.org/show_bug.cgi?id=16033—Reference type removed https://access.redhat.com/security/cve/CVE-2026-4480 Types: Mitigation, Third Party Advisory—Reference type removed https://bugzilla.redhat.com/show_bug.cgi?id=2452232 Types: Issue Tracking, Third Party Advisory—Reference type removed https://bugzilla.samba.org/show_bug.cgi?id=16033 Types: Issue Tracking, Vendor Advisory—Source identifier: secalert@redhat.com
Record modifiedRed Hat ADP
Show 30 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://access.redhat.com/errata/RHSA-2026:22644Reference added —https://access.redhat.com/errata/RHSA-2026:22963Reference added —https://access.redhat.com/errata/RHSA-2026:25049Reference added —https://access.redhat.com/errata/RHSA-2026:25979Reference added —https://access.redhat.com/errata/RHSA-2026:28053Reference added —https://access.redhat.com/errata/RHSA-2026:28054Reference added —https://access.redhat.com/errata/RHSA-2026:28055Reference added —https://access.redhat.com/errata/RHSA-2026:28056Reference added —https://access.redhat.com/errata/RHSA-2026:28057Reference added —https://access.redhat.com/errata/RHSA-2026:28058Reference added —https://access.redhat.com/errata/RHSA-2026:28132Reference added —https://access.redhat.com/security/cve/CVE-2026-4480Reference added —https://bugzilla.redhat.com/show_bug.cgi?id=2452232Reference added —https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4480.jsonReference removed https://access.redhat.com/errata/RHSA-2026:22644—Reference removed https://access.redhat.com/errata/RHSA-2026:22963—Reference removed https://access.redhat.com/errata/RHSA-2026:25049—Reference removed https://access.redhat.com/errata/RHSA-2026:25979—Reference removed https://access.redhat.com/errata/RHSA-2026:28053—Reference removed https://access.redhat.com/errata/RHSA-2026:28054—Reference removed https://access.redhat.com/errata/RHSA-2026:28055—Reference removed https://access.redhat.com/errata/RHSA-2026:28056—Reference removed https://access.redhat.com/errata/RHSA-2026:28057—Reference removed https://access.redhat.com/errata/RHSA-2026:28058—Reference removed https://access.redhat.com/errata/RHSA-2026:28132—Reference removed https://access.redhat.com/security/cve/CVE-2026-4480—Reference removed https://bugzilla.redhat.com/show_bug.cgi?id=2452232—Reference removed https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4480.json—Reference type removed https://access.redhat.com/security/cve/CVE-2026-4480 Types: Mitigation, Third Party Advisory—Reference type removed https://bugzilla.redhat.com/show_bug.cgi?id=2452232 Types: Issue Tracking, Third Party Advisory—Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Record 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 Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support (+14)Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support (+14)Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Record modifiedRed Hat
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 Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support (+17)Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 7 Extended Lifecycle Support (+17)Source identifier: secalert@redhat.com
Show 3 older changes
Record modifiedRed Hat
Show 4 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —https://access.redhat.com/errata/RHSA-2026:28054Reference added —https://access.redhat.com/errata/RHSA-2026:28055Reference added —https://access.redhat.com/errata/RHSA-2026:28056Affected versions (publisher) changed Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8 (+11)Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8 (+15)Source identifier: secalert@redhat.com
Record modifiedRed Hat
New references:Show the original change
Individual changes of this event as published by NVD Type Action Before After Reference added —https://access.redhat.com/errata/RHSA-2026:25979Source identifier: secalert@redhat.com
Record modifiedRed Hat
New references:Show the original change
Individual changes of this event as published by NVD Type Action Before After Reference added —https://access.redhat.com/errata/RHSA-2026:25049Source identifier: secalert@redhat.com
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-4480"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-4480.svg?lang=en" alt="CVE-2026-4480 – NEOSEC Intel" height="20"></a>