CVE-2026-4480 — Red Hat Enterprise Linux 10

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.

The record classifies CVE-2026-4480 under weakness class CWE-78. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 6 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 155 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 8.5 — HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS (FIRST): 13.9% probability of exploitation in the next 30 days, higher than 96.4% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-05-26, last modified 2026-09-01

Is CVE-2026-4480 being exploited?

Weaponised exploit code for CVE-2026-4480 is publicly available. 8 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (javascript/cves/2026/CVE-2026-4480.yaml). It currently carries a trending score of 39 in the Threadlinqs vulnerability feed.

TheCyberGeek/CVE-2026-4480-PoC (github)
0xBlackash/CVE-2026-4480 (github)
saitoken241/CVE-2026-4480-POC (github)
AlanNewberry/CVE-2026-4480-samba-print-command-injection-rce (github)
robinxiang/CVE-2026-4480 (github)
Vusal777/CVE-2026-4480-exploit-poc (github)
ClearLotus-git/CVE-2026-4480-PoC (github)
timgad794/Abducted-HTB-Writeup (github)

Affected products and versions

Red Hat: Enterprise Linux 10, Enterprise Linux 8, Enterprise Linux 9, Enterprise Linux 6, Enterprise Linux 7, OpenShift Container Platform 4

How to fix CVE-2026-4480

No vendor patch reference has been recorded for CVE-2026-4480 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-4480

1 tracked threat in the Threadlinqs corpus references CVE-2026-4480, either in the campaign’s CVE list or as an indicator on the campaign record.

Samba Printing Subsystem Remote Code Execution — CVE-2026-4480 (%J Print-Job Description Command Injection, CVSS 10.0, Unauthenticated) — CRITICAL · 2026-05-29

Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on 2026-10-10.