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CRITICAL

CVE-2026-4480

CVSS v3

9

CRITICAL

EPSS Score

13.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • sambaAlmaLinux:10all versions · fixed in 4.23.5-109.el10_2and 36 other packages
  • sambaAlmaLinux:9all versions · fixed in 4.23.5-10.el9_8and 36 other packages
  • sambaAlmaLinux:8all versions · fixed in 4.19.4-16.el8_10and 33 other packages

Vendor advisories

  • CVE-2026-4480 Red Hat Product Security4,182 products fixed · 30 known affected

    samba: Samba: Remote Code Execution in printing subsystem via unescaped job description

    libsmbclient as a component of Red Hat Enterprise Linux 6 · libsmbclient-devel as a component of Red Hat Enterprise Linux 6 · samba as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:28132 Red Hat Product Security145 products fixed

    Red Hat Security Advisory: samba security update

  • RHSA-2026:28053 Red Hat Product Security393 products fixed

    Red Hat Security Advisory: samba security update

  • RHSA-2026:28054 Red Hat Product Security393 products fixed

    Red Hat Security Advisory: samba security update

  • RHSA-2026:28055 Red Hat Product Security467 products fixed

    Red Hat Security Advisory: samba security update

  • RHSA-2026:28056 Red Hat Product Security298 products fixed

    Red Hat Security Advisory: samba security update

6 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
2026-05-26
Last Modified
2026-07-24

Frequently asked questions

What is CVE-2026-4480?

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.

Is CVE-2026-4480 actively exploited?

Active exploitation of CVE-2026-4480 has not been confirmed. Its EPSS score was 13.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-4480?

CVE-2026-4480 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

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