CVE-2026-18374
MediumCVSS 4.9Summary
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.
Risk Assessment
An attacker could exploit this vulnerability to cause application crashes or potentially execute code if the application processes untrusted input for `ccs`.
Recommendation
Update glibc to a patched version or avoid passing user-controlled `ccs` values without validation.
Original NVD description (English source)
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.