coturn: Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-40613 is fixed in coturn on 1 platform by DEBIAN-CVE-2026-40613 (version 4.12.0-1), released April 21, 2026. It is not reported as exploited. Patch Radar priority: High.
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| coturn · Debian 14 | 4.12.0-1 | DEBIAN-CVE-2026-40613 | Apr 21, 2026 |
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