Bug 2567536 (CVE-2026-116784)

Summary: CVE-2026-116784 freeswitch: FreeSWITCH: Denial of Service via out-of-bounds read in RTCP packet processing
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 participating in an active call can trigger an out-of-bounds read by sending a specially crafted Real-time Transport Control Protocol (RTCP) packet with an oversized declared length. This flaw can cause the FreeSWITCH service to crash, resulting in a Denial of Service (DoS) and terminating active calls.
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Description OSIDB Bzimport 2026-11-05 22:05:36 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, process_rtcp_report() used an RTPFB NACK packet's declared RTCP header length as its feedback-entry loop bound instead of the datagram length already validated by the caller. A short packet with an oversized declaration could drive reads far beyond the fixed 16 KiB receive buffer. Any peer able to send RTCP to an active video call can reach the flaw, including calls where remote SDP enables video RTCP even though the SIP profile has no explicit RTCP interval configured. The out-of-bounds read can crash FreeSWITCH and terminate every active call, but supplies no write primitive and does not echo the read values to the sender. This issue is fixed in version 1.11.2.