Heap Buffer Overflow in GNU C Library Affects Parameter Handling

CVE-2026-18374

What is CVE-2026-18374?

A vulnerability exists in the GNU C Library versions up to 2.45 that can lead to a heap buffer overflow. This occurs when an attacker provides a malformed empty string to the ,ccs= syntax extension of the mode argument used in the fopen function. If the input to the fopen function, specifically for the ccs parameter, is not properly validated, applications may be exposed to exploitation. This issue highlights the critical necessity of implementing rigorous input validation when handling user-supplied values to prevent potential attacks and maintain system integrity.

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