CVE-2026-18374 Affecting glibc-2.43 package, versions <2.43-r18


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.14% (4th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-GLIBC243-20840313
  • published12 Oct 2026
  • disclosed27 Aug 2026

Introduced: 27 Aug 2026

CVE-2026-18374  (opens in a new tab)

How to fix?

Upgrade Chainguard glibc-2.43 to version 2.43-r18 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream glibc-2.43 package and not the glibc-2.43 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Passing an effectively empty string to the ,ccs= syntax extension of the mode argument in the fopen function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled.

This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for ccs should not pass them through without validation.

CVSS Base Scores

version 3.1