pjsip pjproject SDP negotiator sdp_neg.c assign_pt_and_update_map out-of-bounds

Summaryinfo

A vulnerability was found in pjsip pjproject and classified as critical. Affected by this vulnerability is the function assign_pt_and_update_map of the file pjmedia/src/pjmedia/sdp_neg.c of the component SDP negotiator. The manipulation results in out-of-bounds. This vulnerability is reported as CVE-2026-57159. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in pjsip pjproject (the affected version is unknown). It has been classified as critical. Affected is the function assign_pt_and_update_map of the file pjmedia/src/pjmedia/sdp_neg.c of the component SDP negotiator. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-57159 since 06/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Applying the patch 673b978aab1fe3ab874247be32c871acc880cbeb is able to eliminate this problem.

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Productinfo

Type

• Project Management Software

Vendor

• pjsip

Name

• pjproject

License

• open-source

Website

• Product: https://github.com/pjsip/pjproject/

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