CVE-2026-62959

Name	CVE-2026-62959
Description	Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
coturn (PTS)	bullseye	4.5.2-3	vulnerable
	bookworm	4.6.1-1	vulnerable
	trixie	4.6.1-2	vulnerable
	forky, sid	4.15.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
coturn	source	(unstable)	4.15.0-1

Notes

https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g
https://github.com/coturn/coturn/pull/1965
Fixed by: https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4 (4.15.0)