Description
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.
Published: 2026-08-27
Score: 4.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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History

Fri, 28 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 28 Aug 2026 05:45:00 +0000

Type Values Removed Values Added
First Time appeared The Gnu C Library
The Gnu C Library glibc
Vendors & Products The Gnu C Library
The Gnu C Library glibc

Thu, 27 Aug 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'}


Subscriptions

The Gnu C Library Glibc
cve-icon MITRE

Status: PUBLISHED

Assigner: glibc

Published:

Updated: 2026-08-28T15:37:10.821Z

Reserved: 2026-07-30T10:48:56.220Z

Link: CVE-2026-18374

cve-icon Vulnrichment

Updated: 2026-08-27T22:21:53.526Z

cve-icon NVD

Status : Received

Published: 2026-08-27T20:17:03.553

Modified: 2026-08-28T00:16:48.620

Link: CVE-2026-18374

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T06:30:18Z

Weaknesses