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

What is CVE-2026-34235?

CVE-2026-34235 is a medium-severity memory corruption vulnerability in pjsip pjproject, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-125

Which versions are affected by CVE-2026-34235?

It affects 1 product.

Products include Teluu Pjsip.

How do I fix CVE-2026-34235?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-34235 being exploited?

There is no known exploitation of CVE-2026-34235 in the wild and no public exploit code.

Other vulnerabilities in pjsip pjproject

• CVE-2023-38703 PJSIP has use-after-free vulnerability in SRTP media transport Critical 9.8
• CVE-2022-39269 Media transport downgrade from the secure version (SRTP) to non-secure (RTP) in pjsip Critical 9.1
• CVE-2026-57161 PJSIP: Stack overflow handling Service-Route headers in a registration response High 8.8
• CVE-2026-57162 PJSIP: Stack overflow parsing SDP a=crypto attributes High 8.8
• CVE-2026-57163 PJSIP: Stack overflow parsing a TLS peer certificate's SubjectAltName in GnuTLS backend High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-34235, DEBIAN-CVE-2026-34235, GHSA-pqrm-53pc-wx28, UBUNTU-CVE-2026-34235.