Cyber Resilience

CVE-2026-4480

CriticalRCEUpdated

Published: 26 May 2026

Published
26 May 2026
Modified
30 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.1280 95.8th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-4480 is a critical-severity OS Command Injection (CWE-78) vulnerability in Redhat Enterprise Linux. Its CVSS base score is 9.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 4.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

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…

more

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.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Direct OS command injection (CWE-78) in exposed Samba print service enables remote code execution via crafted input to a network-facing component.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-4408Same product: Redhat Enterprise Linux
CVE-2026-3012Same product: Redhat Enterprise Linux
CVE-2026-1933Same product: Redhat Enterprise Linux
CVE-2025-32988Same product: Redhat Enterprise Linux
CVE-2026-33845Same product: Redhat Enterprise Linux
CVE-2026-42010Same product: Redhat Enterprise Linux
CVE-2026-5121Same product: Redhat Enterprise Linux
CVE-2025-43984Shared CWE-78
CVE-2026-34176Shared CWE-78
CVE-2026-47294Shared CWE-78

Affected Assets

redhat
openshift container platform
4.0
samba
samba
4.1.0 — 4.2.1
redhat
enterprise linux
10.0, 7.0, 8.0, 9.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References