PT-2026-66781 · Hfiref0X · Lightftp

Gjoko Krstic · CVE-2026-67607 · Published 2026-07-31 · Updated 2026-07-31

NVD

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Exploit

Fix

Time Of Check To Time Of Use

Weakness Enumeration

CWE-367

Related Identifiers

CVE-2026-67607

Affected Products

Lightftp

References · 3

• 🔥 https://github.com/zeroscience/tuktam#real-world-case-study-lightftp-cve-2024-11144 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-67607 · Security Note
• https://vulncheck.com/advisories/lightftp-race-condition-dos-via-worker-thread-cleanup · Note