CVE-2026-67607

Description

LightFTP 2.3.1 contains a race condition vulnerability that allows remote attackers to crash the server by racing a fresh connection that reuses the FTP context against an in-progress ABRT cleanup. Attackers can exploit the unprotected re-check of WorkerThreadId between worker_thread_cleanup() and pthread_join() outside of MTLock to cause pthread_join() to operate on an invalid thread ID, resulting in a server crash. CVE-2024-11144 identifies an incomplete fix of this vulnerability.

CVSS Vector

References

• https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144
• https://www.vulncheck.com/advisories/lightftp-race-condition-dos-via-worker-thread-cleanup
• https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144