Bug 2567576 (CVE-2026-116568)

Summary: CVE-2026-116568 freeswitch: freeswitch: Denial of Service via crafted RTMP video stream
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeSWITCH. A remote attacker can trigger a Denial of Service (DoS) by sending a specially crafted Real-Time Messaging Protocol (RTMP) video stream to a server running the RTMP module. Due to insufficient validation of video unit length headers, parsing the malformed stream causes an out-of-bounds memory read that crashes the service process and terminates active calls.
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Description OSIDB Bzimport 2026-11-05 22:09:13 UTC 
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.2, rtmp_rtmp2rtpH264() trusted the length prefix of each inbound H.264 NAL unit without checking it against the bytes remaining in the RTMP message. An oversized declared unit underflowed the unsigned remaining-byte counter and advanced the parser beyond its receive buffer, where the next length-prefix read could crash the process. The flaw affects deployments that build and load mod_rtmp and accept video call sessions, commonly on TCP port 1935; placing the call requires a directory login where auth-calls is true, while no credentials are required where auth-calls is absent or false. A remote client can terminate FreeSWITCH and every active call, but the defect supplies no write primitive and memory disclosure has not been demonstrated. This issue is fixed in version 1.11.2.