CVE-2026-15809Github.com/cri-o/cri-o: fix bypass for cve-2022-4318 — /etc/passwd injection via home env

Description

A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of arbitrary lines into /etc/passwd by use of a specially crafted environment variable.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• RHSA-2026:57361 vendor-advisory
• RHSA-2026:60444 vendor-advisory
• RHSA-2026:60449 vendor-advisory
• RHSA-2026:60452 vendor-advisory
• RHSA-2026:62548 vendor-advisory
• RHSA-2026:65838 vendor-advisory
• RHSA-2026:65906 vendor-advisory
• RHSA-2026:66385 vendor-advisory
• RHSA-2026:67836 vendor-advisory
• RHSA-2026:67856 vendor-advisory
• RHSA-2026:70585 vendor-advisory
• https://access.redhat.com/security/cve/CVE-2026-15809 vdb-entry
• RHBZ#2500846 issue-tracking
• https://github.com/cri-o/cri-o/pull/6450
• https://github.com/cri-o/cri-o/pull/6524