CVE-2025-40843: 
Python vulnerability analysis and mitigation

A buffer overflow vulnerability was discovered in CodeChecker versions up to 6.26.1, specifically in the internal ldlogger library executed by the CodeChecker log command. The vulnerability was assigned CVE-2025-40843 and was reported by barnabasdomozi (GitHub Advisory).

The vulnerability stems from unsafe usage of strcpy() function in the internal ldlogger library. The destination buffer is stack-allocated with a fixed size of 4096 bytes, while strcpy() is called without any length checks, enabling an attacker to overrun the buffer. The vulnerability has been classified as CWE-121 (Stack-based Buffer Overflow) with a CVSS v3.1 base score of 5.9 MEDIUM (Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) (GitHub Advisory).

When exploited, this vulnerability could allow attackers to trigger a buffer overflow by supplying crafted inputs from the command line. Any environment where the vulnerable CodeChecker log command is executed with untrusted user input is affected by this vulnerability (GitHub Advisory).

The vulnerability has been patched in CodeChecker version 6.26.2. Users are advised to upgrade to this version or later to mitigate the vulnerability (GitHub Advisory).