CVE-2026-68554
Description
A flaw was found in Coturn, a free open source implementation of TURN and STUN (Session Traversal Utilities for NAT) Server. An on-path attacker can exploit this vulnerability on plain UDP or TCP by appending attributes after the MESSAGE-INTEGRITY field in an authenticated STUN request. This allows the attacker to modify the request by overriding allocation lifetime, injecting permissions, or bypassing origin checks, potentially leading to unauthorized actions or resource manipulation.
Statement
Coturn is not shipped in any Red Hat product. The Fedora and EPEL community builds ship coturn version 4.17.2, which already includes the fix for this issue (fixed in 4.15.0) and are therefore not affected.
Mitigation
Upgrade to coturn version 4.15.0 or later. Deployments using TLS or DTLS transports are not vulnerable to this issue.
Understanding the Weakness (CWE)
Integrity,Other
Technical Impact: Modify Application Data; Other
Integrity checks usually use a secret key that helps authenticate the data origin. Skipping integrity checking generally opens up the possibility that new data from an invalid source can be injected.
Integrity,Other
Technical Impact: Other
Data that is parsed and used may be corrupted.
Non-Repudiation,Other
Technical Impact: Hide Activities; Other
Without a checksum check, it is impossible to determine if any changes have been made to the data after it was sent.
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