CriticalCVE-2026-4480

    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

    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
    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

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

    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 products
    Affected versionsFixed in
    Red HatRed Hat Enterprise Linux 10
    • < 0:4.23.5-109.el10_2
    • 0:4.23.5-109.el10_2
    Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
    • < 0:4.21.3-114.el10_0.1
    • 0:4.21.3-114.el10_0.1
    Red HatRed Hat Enterprise Linux 6
    • —
    • —
    Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support
    • < 0:4.10.16-26.el7_9.1
    • 0:4.10.16-26.el7_9.1
    Red HatRed Hat Enterprise Linux 8
    • < 0:4.19.4-16.el8_10
    • 0:4.19.4-16.el8_10
    Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
    • < 0:4.13.3-12.el8_4.1
    • 0:4.13.3-12.el8_4.1
    Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
    • < 0:4.13.3-12.el8_4.1
    • 0:4.13.3-12.el8_4.1
    Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
    • < 0:4.15.5-16.el8_6.1
    • 0:4.15.5-16.el8_6.1
    Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
    • < 0:4.15.5-16.el8_6.1
    • 0:4.15.5-16.el8_6.1
    Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
    • < 0:4.17.5-7.el8_8.1
    • 0:4.17.5-7.el8_8.1
    Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
    • < 0:4.17.5-7.el8_8.1
    • 0:4.17.5-7.el8_8.1
    Red HatRed Hat Enterprise Linux 9
    • < 0:4.23.5-10.el9_8
    • 0:4.23.5-10.el9_8
    Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
    • < 0:4.17.5-105.el9_2.5
    • 0:4.17.5-105.el9_2.5
    Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions
    • < 0:4.19.4-105.el9_4.4
    • 0:4.19.4-105.el9_4.4
    Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
    • < 0:4.21.3-14.el9_6.1
    • 0:4.21.3-14.el9_6.1
    Red HatRed Hat OpenShift Container Platform 4
    • —
    • —
    redhatopenshift_container_platform
    • 4.0
    • —
    sambasamba
    • 4.1.0 – < 4.2.1
    • 4.2.1
    Open SourceSamba
    • < 4.24.3
    • < 4.22.10
    • < 4.23.8
    • 4.24.3
    • 4.22.10
    • 4.23.8

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxredhatenterprise_linux10.0
    Linuxredhatenterprise_linux7.0
    Linuxredhatenterprise_linux8.0
    Linuxredhatenterprise_linux9.0
    Linuxdebiansambabookworm
    Linuxdebiansambabullseye
    Linuxdebiansambatrixie

    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.

    Public exploit references
    PoC-in-GitHub (nomi-sec)CVE-2026-4480-samba-print-command-injection-rce (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)Abducted-HTB-Writeup (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)HTB-Abducted-Writeup (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)CVE-2026-4480-exploit-poc (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)CVE-2026-4480 (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)CVE-2026-4480 (opens in a new tab)github.comPoC (publicly reported)reported, not verified
    PoC-in-GitHub (nomi-sec)CVE-2026-4480 (opens in a new tab)github.comPoC (publicly reported)reported, not verified

    References & sources

    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).

    1. Record modifiedRed Hat

      1 individual change: Affected versions (publisher)

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      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

    2. Record modifiedRed Hat

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      https://bugzilla.redhat.com/show_bug.cgi?id=2452232
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      https://bugzilla.samba.org/show_bug.cgi?id=16033
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      https://bugzilla.samba.org/show_bug.cgi?id=16033 Types: Issue Tracking, Vendor Advisory
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      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat ADP

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

    4. Record modifiedRed Hat ADP

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      TypeActionBeforeAfter
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      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

    5. Record modifiedRed Hat

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      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

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    1. Record modifiedRed Hat

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      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

    2. Record modifiedRed Hat

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      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

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      Source identifier: secalert@redhat.com

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