What’s Vulnerable › Vulnerabilities

CVE-2026-57159: PJSIP: SDP parser out-of-bounds write in remote payload-type map maintenance

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-11
• Weakness: CWE-129

Description

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.

Affected products

• teluu pjsip: through 2.17

References

• https://github.com/pjsip/pjproject/commit/673b978aab1fe3ab874247be32c871acc880cbeb
• https://github.com/pjsip/pjproject/security/advisories/GHSA-rfwg-w9gq-9mw2

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