CVE-2026-4480: Samba: samba: remote code execution in printing subsystem via unescaped job description

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 28 Oct 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

13.9%

EPSS score, percentile 96.5 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

9.0 Critical

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (11)

Which versions are affected?

Unaffected 0:4.23.5-109.el10_2; 0:4.21.3-114.el10_0.1; 0:4.10.16-26.el7_9.1; 0:4.10.16-26.el7_9.1; 0:4.19.4-16.el8_10; 0:4.19.4-16.el8_10; and 11 more

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Workaround (from the CVE record)

Remove ```"%J"``` from the "print command" in ```smb.conf``` entry.

Advisories and patches

• RHSA-2026:22644 (Vendor advisory)
• RHSA-2026:22963 (Vendor advisory)
• RHSA-2026:25049 (Vendor advisory)
• RHSA-2026:25979 (Vendor advisory)
• RHSA-2026:28053 (Vendor advisory)
• RHSA-2026:28054 (Vendor advisory)
• RHSA-2026:28055 (Vendor advisory)
• RHSA-2026:28056 (Vendor advisory)
• RHSA-2026:28057 (Vendor advisory)
• RHSA-2026:28058 (Vendor advisory)
• RHSA-2026:28132 (Vendor advisory)

Affected products and versions

As listed in the CVE record.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: affected.

Versions not listed are: unknown.

Versions not listed are: unknown.

Versions not listed are: affected.

Versions the record lists as unaffected: 0:4.23.5-109.el10_2, 0:4.21.3-114.el10_0.1, 0:4.10.16-26.el7_9.1, 0:4.19.4-16.el8_10, 0:4.13.3-12.el8_4.1, 0:4.15.5-16.el8_6.1, 0:4.17.5-7.el8_8.1, 0:4.23.5-10.el9_8.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

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…

Summary: CVE record, as of 28 Oct 2026.

• CISA has not added CVE-2026-4480 to its Known Exploited Vulnerabilities (KEV) catalog, as of 28 Oct 2026.
• The CVE record was published on 26 May 2026.
• The CVE record carries a CVSS v3.1 base score of 9.0 (Critical), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 13.9% (percentile 96.5), as of 28 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
• CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Samba: samba: remote code execution in printing subsystem via unescaped job 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: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-78

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

References

• access.redhat.com (Vulnerability database)

2 more in the CVE record.

Known exploited Red Hat vulnerabilities

• CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added 26 Aug 2026)
• CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added 26 Aug 2026)
• CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added 28 Sep 2023)
• CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added 12 May 2023)
• CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added 27 Jun 2022)