PatchSiren cyber security CVE debrief
CVE-2026-67607 hfiref0x CVE debrief
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. The CVE record was published on 2026-07-31T16:17:11.913Z and has not been modified since then. Administrators and users of LightFTP 2.3.1 should verify and apply patches to prevent potential server crashes. Additionally, security teams and vulnerability management teams should review the official CVE record and vendor guidance to validate affected scope, severity, and vendor guidance. Operators of affected systems should prioritize patching and implement compensating controls to mitigate potential attacks.
- Vendor
- hfiref0x
- Product
- LightFTP
- CVSS
- HIGH 8.2
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-31
- Original CVE updated
- 2026-07-31
- Advisory published
- 2026-07-31
- Advisory updated
- 2026-07-31
Who should care
Administrators and users of LightFTP 2.3.1 should verify and apply patches to prevent potential server crashes. Additionally, security teams and vulnerability management teams should review the official CVE record and vendor guidance to validate affected scope, severity, and vendor guidance. Operators of affected systems should prioritize patching and implement compensating controls to mitigate potential attacks.
Technical summary
CVE-2026-67607 is a race condition vulnerability in LightFTP 2.3.1 that allows remote attackers to crash the server by exploiting the unprotected re-check of WorkerThreadId between worker_thread_cleanup() and pthread_join() outside of MTLock. This vulnerability can be mitigated by verifying and applying patches. The CVE record indicates that CVE-2024-11144 identifies an incomplete fix of this vulnerability.
Defensive priority
CVE-2026-67607 is rated HIGH with a CVSS score of 8.2; verify and apply vendor patches immediately.
Recommended defensive actions
- Verify LightFTP version and apply patches
- Review server configurations for potential vulnerabilities
- Implement compensating controls to mitigate potential attacks
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
- Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
- Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
- Check relevant monitoring, detection, and logs for exposed assets that need extra review
Evidence notes
The CVE-2026-67607 record indicates LightFTP 2.3.1 has a race condition vulnerability allowing remote attackers to crash the server by exploiting the unprotected re-check of WorkerThreadId between worker_thread_cleanup() and pthread_join() outside of MTLock. To verify affected versions and apply patches, defenders should review the official CVE record and vendor guidance. Evidence is limited to public sources, and further verification is needed to confirm the scope of affected systems.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-31T16:17:11.913Z and has not been modified since then.