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CVE-2026-53450

7.4 · HIGH

Coturn is a free open source implementation of TURN and STUN Server.

Published Jul 10, 2026CWE-918EPSS 0.29%

Overview

CVE-2026-53450 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, coturn rejects loopback peers by default unless allow-loopback-peers is enabled, but the default loopback guard can be bypassed by using the IPv4-mapped IPv6 peer address ::ffff:127.0.0.1 in a TURN XOR-PEER-ADDRESS attribute. ioa_addr_is_loopback checks for the literal IPv6 loopback shape before IPv4-mapped IPv6 handling, so good_peer_addr does not apply the default loopback rejection and an authenticated TURN client can expose services bound only to localhost on the coturn host through TURN relay traffic. This issue is fixed in version 4.13.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/coturn/coturn/commit/b057acbebe721c8f2f202ddad5e16289e295c754GitHubgithub.com/coturn/coturn/security/advisories/GHSA-w4hf-cr3w-6h79GitHubgithub.com/coturn/coturn/security/advisories/GHSA-w4hf-cr3w-6h79

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53450?

CVE-2026-53450 is a high-severity vulnerability. It was published on July 10, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-53450?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53450?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53450?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53450 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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