Use of Externally-Controlled Format String The advisory has been revoked - it doesn't affect any version of package glibc-langpack-os (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-GLIBCLANGPACKOS-19456308
- published1 Sept 2026
- disclosed27 Aug 2026
Introduced: 27 Aug 2026
CVE-2026-18374 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream glibc-langpack-os package and not the glibc-langpack-os package as distributed by RHEL.
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.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2525256
- https://access.redhat.com/security/cve/CVE-2026-18374
- https://access.redhat.com/errata/RHSA-2026:65339
- https://access.redhat.com/errata/RHSA-2026:84753
- https://sourceware.org/bugzilla/show_bug.cgi?id=34574
- https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0015
- http://www.openwall.com/lists/oss-security/2026/08/27/6