Status: UPDATED | Advisory ID: CVE-2026-40613
| CVE | CVE-2026-40613 |
| CVSS Score / Version | 7.5 (High) / CVSS v3.1 |
| Updated | 2026-06-17 |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CVSS Prose | attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high. |
| Affected products | coturn_project coturn |
| Classified as | CWE-704 (Incorrect Type Conversion or Cast) |
| Vendor | Product | Affected Versions | Patch Status |
|---|---|---|---|
| coturn_project | coturn |
| Subsystems | General OT |
| Sectors | Multiple |
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. (NVD)
Monitor coturn_project's web page for any future patch releases. See vendor advisory link below.