Type conversion in coTURN - CVE-2026-40613

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Main Vulnerability Database Vulnerabilities #VU126581

Type conversion in coTURN - CVE-2026-40613

Published: April 20, 2026


Vulnerability identifier: #VU126581
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-40613
CWE-ID: CWE-704
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

coTURN
Fedora
coturn

How to mitigate CVE-2026-40613

Install security update from vendor's website.

coTURN - update to 4.10.0
coturn - addressed in versions 4.10.0-1.el8, 4.10.0-1.el9, 4.10.0-1.el10_1, 4.10.0-1.el10_2, 4.10.0-1.el10_3, 4.10.0-1.fc42, 4.10.0-1.fc43, 4.10.0-1.fc44

External References

Related Security Bulletins