CVE-2023-6779: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 3.2% chance of exploitation in the next 30 days.

An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.

Affected products

• Fedoraproject Fedora: version 38 only; version 39 only
• GNU Glibc: from 2.37, before 2.39 (fixed in 2.39)

Published 2024-01-31. Last modified 2026-06-17.