# CVE-2026-57159

## Summary

- **CVE ID:** CVE-2026-57159
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-129, CWE-787
- **Published:** Sep 4, 2026
- **Last Modified:** Sep 8, 2026

## 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

- pjsip — pjproject (< 673b978aab1fe3ab874247be32c871acc880cbeb)

## References

- [CNA](https://github.com/pjsip/pjproject/security/advisories/GHSA-rfwg-w9gq-9mw2)
- [CNA](https://github.com/pjsip/pjproject/commit/673b978aab1fe3ab874247be32c871acc880cbeb)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._