Bug 2528778 (CVE-2026-57162)

Summary: CVE-2026-57162 pjsip: stack overflow parsing SDP a=crypto attributes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: urgent    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in PJSIP. A stack buffer overflow exists in the SRTP/SDES media transport when processing `a=crypto` attributes during SDP offer/answer negotiation. A remote attacker can exploit this by sending an excessive number of `a=crypto` attributes in a single media description. This can result in unexpected application termination or potentially allow for arbitrary code execution. This vulnerability affects applications with SRTP enabled.
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Bug Depends On: 2531088, 2531089, 2531086, 2531087    
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Description OSIDB Bzimport 2026-09-04 17:32:48 UTC 
PJSIP is a free and open source multimedia communication library written in C. Prior to commit a1b707c, a stack buffer overflow exists in the SRTP/SDES media transport when processing a=crypto attributes during SDP offer/answer (sdes_encode_sdp() in transport_srtp_sdes.c). This affects applications with SRTP enabled (use_srtp optional or mandatory, using SDES keying). During media negotiation, the crypto attributes from the remote SDP are collected into a fixed-size array without bounding their number; a remote peer that includes an excessive number of a=crypto attributes in a single media description can write past the end of that array on the stack. This is reachable from an incoming SIP INVITE during offer/answer, before application-level authentication. Impact may range from unexpected application termination to control flow hijack/memory corruption. Applications that do not enable SRTP are not affected. This issue has been patched via commit a1b707c.