Bug 2528774 (CVE-2026-57159)

Summary: CVE-2026-57159 pjsip: SDP parser out-of-bounds write in remote payload-type map maintenance
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 PJSIP. An out-of-bounds read and write can occur in the SDP negotiator when the remote payload-type map maintenance feature is enabled. A remote attacker can trigger this via payload-type numbers taken from a remote SDP offer or answer, which are used as an index to access internal tables without proper bounds validation. This can lead to memory corruption, potentially resulting in a Denial of Service (DoS). This issue affects only applications that enabled the optional PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP feature.
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Bug Depends On: 2531074, 2531075, 2531076, 2531077    
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Description OSIDB Bzimport 2026-09-04 17:31:10 UTC 
PJSIP is a free and open source multimedia communication library written in C. Prior to commit 673b978, a remote out-of-bounds read and write can occur in the SDP negotiator when the remote payload-type map maintenance feature is enabled. assign_pt_and_update_map() in pjmedia/src/pjmedia/sdp_neg.c uses payload-type numbers taken from a remote SDP offer or answer to index fixed-size internal tables without sufficient bounds validation, so a crafted remote SDP can cause memory access outside those tables. The practical impact is memory corruption and denial of service; code execution is not demonstrated. This path is only reached when PJMEDIA_SDP_NEG_MAINTAIN_REMOTE_PT_MAP is enabled. The default is disabled, so default builds are not affected; the feature is an interoperability option that integrating products may enable. This issue has been patched via commit 673b978.