CVE-2026-18374

MediumCVSS 4.9/10Last modified Sep 3, 2026

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.

Metrics

CVSS 3.1 4.9/10CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness enumeration

CWE-787

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

No affected versions have been published.

Timeline

Published: Aug 27, 2026
Last modified: Sep 3, 2026
NVD status: Awaiting Analysis

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