Vulnerability · Published Aug 6, 2026 · Assigned by VulnCheck

CVE-2026-70637LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c

Medium 5.9

In plain English

A medium-severity security flaw in LightFTP from hfiref0x. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.4%top 69.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.

Affected products (as reported)

Vendor	Product	Versions
hfiref0x	LightFTP	0 – through 2.40 – through d28c5e08aa4bd128737d35cc6ee0f9630a910ed5

Weakness: CWE-820 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Researcher Disclosure technical-description, exploit
https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-c third-party-advisory