Incorrect Type Conversion or Cast Affecting coturn package, versions <4.10.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE323-COTURN-16344696
- published2 May 2026
- disclosed21 Apr 2026
Introduced: 21 Apr 2026
NewCVE-2026-40613 (opens in a new tab)How to fix?
Upgrade Alpine:3.23 coturn to version 4.10.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream coturn package and not the coturn package as distributed by Alpine.
See How to fix? for Alpine:3.23 relevant fixed versions and status.
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.