CVE-2025-40843

CodeChecker's massStoreRun processing path performs one-shot decompression of attacker-controlled, Base64-encoded zlib data without enforcing a maximum decompressed size. An authenticated user with permission to store analysis runs can submit a highly compressed payload that expands to a significantly larger byte sequence. Because the entire decompressed output is materialized in memory before being written to a temporary file, a sufficiently large payload may exhaust process or host memory and consume substantial disk space, resulting in denial of service.

In CodeChecker through 6.28.2, there is a flaw in ldlogger-tool-gcc.c:129 where the safe_strcpy() helper (which is strncpy()) writes 4096 bytes into a buffer of 4094 bytes, causing a 2-byte stack overflow on every invocation, independent of the input path's length. The fix for CVE-2025-40843 replaced unchecked strcpy() with a bounded safe_strcpy(), but the size passed was incorrect.