Bug 2509924 (CVE-2026-62959)

Summary: CVE-2026-62959 coturn: Coturn: Pre-authentication heap memory disclosure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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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.
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Description OSIDB Bzimport 2026-07-31 21:01:37 UTC 
Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.