CVE-2026-62959
Description
A flaw was found in Coturn. When configured with ACME redirect and a plaintext-TCP listener, an unauthenticated remote client can send an HTTP GET request. This action can lead to the disclosure of up to approximately 870 bytes of adjacent process heap memory. On a busy server, this leaked memory may contain sensitive information from other clients, such as authentication credentials or relayed data.
Statement
This flaw affects the community-maintained coturn TURN/STUN server as shipped in Fedora and EPEL. Red Hat does not ship coturn in any core Red Hat product. Fedora and EPEL currently ship coturn 4.16.0, which already includes the fix released in 4.15.0, so the shipped builds are not vulnerable.
Mitigation
No action needed - the shipped coturn build (4.16.0) already contains the upstream fix.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory; Read Application Data
When reusing a resource such as memory or a program variable, the original contents of that resource may not be cleared before it is sent to an untrusted party.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
The uninitialized resource may contain values that cause program flow to change in ways that the programmer did not intend.
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