Is CVE-2026-67607 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-67607 being exploited in the wild.

How severe is CVE-2026-67607?

Medium severity, with a CVSS score of 5.9, published 31 July 2026.

Is there a fix for CVE-2026-67607?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-67607 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-67607?

Check whether you run Hfiref0x LightFTP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-67607: hfiref0x LightFTP race condition in worker thread cleanup

CVE-2026-67607 · Severity: medium · CVSS 5.9 · Published 2026-07-31

LightFTP is a lightweight file transfer server used to share files over a network. A flaw in how the server manages internal connections allows a remote attacker to cause the service to crash by timing specific requests. This results in a denial-of-service, preventing legitimate users from accessing or transferring files until the server is manually restarted.

Technologies: Hfiref0x LightFTP. Vendors: Hfiref0x.

Quick answers

Is CVE-2026-67607 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-67607 being exploited in the wild.
How severe is CVE-2026-67607?: Medium severity, with a CVSS score of 5.9, published 31 July 2026.
Which products and versions are affected?: Hfiref0x LightFTP <= 2.3.1.
Is there a fix for CVE-2026-67607?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-67607 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-67607?: Check whether you run Hfiref0x LightFTP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Time-of-Check Time-of-Use (TOCTOU) race condition exists in LightFTP version 2.3.1 and earlier. The vulnerability occurs when a fresh connection reuses an FTP context while an ABRT cleanup is simultaneously in progress. Specifically, an unprotected re-check of WorkerThreadId occurs between the worker_thread_cleanup() and pthread_join() functions outside of the MTLock mutex. This allows an attacker to cause pthread_join() to operate on an invalid thread ID, triggering a server crash. This issue represents an incomplete fix for a previously identified vulnerability (CVE-2024-11144). Exploitation requires high timing precision but no authentication.

Affected products

hfiref0x LightFTP <= 2.3.1

Timeline

2026-07-31: advisory: NVD and VulnCheck published the advisory

References

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