Type conversion in coTURN - CVE-2026-40613
Published: April 20, 2026
Vulnerability identifier: #VU126581
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-40613
CWE-ID: CWE-704
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: coTURN
Affected software:
coTURN
coTURN
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to incorrect type conversion or cast in the STUN attribute parser in src/client/ns_turn_msg.c when processing a crafted STUN message with odd-aligned attribute boundaries. A remote attacker can send a specially crafted UDP packet to cause a denial of service.
Only ARM64/AArch64 deployments with strict alignment enforcement are affected.
How to mitigate CVE-2026-40613
Install security update from vendor's website.