PT-2026-66853 · Coturn · Coturn

CVE-2026-62959 · Published 2026-07-31 · Updated 2026-07-31

NVD

CVSS v4.0

8.2

High

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Out of bounds Read

Weakness Enumeration

CWE-195

CWE-125

Related Identifiers

CVE-2026-62959

Affected Products

Coturn

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-62959 · Security Note
• https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4 · Note
• https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g · Note
• https://github.com/coturn/coturn/releases/tag/4.15.0 · Note
• https://github.com/coturn/coturn/pull/1965 · Note