High [CVE-2026-62959] Pre-authentication heap memory disclosure
This high-severity Red Hat Linux advisory covers CVE-2026-62959.
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Summary
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 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. A flaw was found in Coturn.
On a busy server, this leaked memory may contain sensitive information from other clients, such as authentication credentials or relayed data. This flaw affects the community-maintained coturn TURN/STUN server as shipped in Fedora and EPEL.
Red Hat does not ship coturn in any core Red Hat product. Fedora and EPEL currently ship coturn 4.16.0, which already includes the fix released in 4.15.0, so the shipped builds are not vulnerable.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-908.
- 4.5.2
- 4.14.0
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- No action needed - the shipped coturn build (4.16.0) already contains the upstream fix.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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