Use of Externally-Controlled Format String Affecting cri-o package, versions <0:1.27.8-22.rhaos4.14.git0633bf1.el9


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-RHEL9-CRIO-20159136
  • published27 Sept 2026
  • disclosed15 Jul 2026

Introduced: 15 Jul 2026

CVE-2026-15809  (opens in a new tab)
CWE-134  (opens in a new tab)

How to fix?

Upgrade RHEL:9 cri-o to version 0:1.27.8-22.rhaos4.14.git0633bf1.el9 or higher.
This issue was patched in RHSA-2026:67836.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cri-o package and not the cri-o package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1