CVE-2026-33069 PJSIP has an Out-of-bounds Read in SIP multipart parsing

What is CVE-2026-33069?

CVE-2026-33069 is a medium-severity memory corruption vulnerability in pjsip pjproject, published on 20 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. Versions 2.16 and below have a cascading out-of-bounds heap read in pjsip_multipart_parse(). After boundary string matching, curptr is advanced past the delimiter without verifying it has not reached the buffer end. This allows 1-2 bytes of adjacent heap memory to be read. All applications that process incoming SIP messages with multipart bodies or SDP content are potentially affected. This issue is resolved in version 2.17.

Weakness: CWE-125

Which versions are affected by CVE-2026-33069?

It affects 1 product.

Products include Pjsip Pjsip.

How do I fix CVE-2026-33069?

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-2026-33069 being exploited?

There is no known exploitation of CVE-2026-33069 in the wild and no public exploit code.

Other vulnerabilities in pjsip pjproject

• CVE-2026-28799 PJSIP: Heap use-after-free in PJSIP presence subscription termination handler High 8.7
• CVE-2026-29068 PJSIP: Stack buffer overflow in Opus codec parser High 8.7
• CVE-2026-40614 PJSIP: Heap buffer overflow in Opus codec decoding High 8.5
• CVE-2026-32945 PJSIP is vulnerable to Heap-based Buffer Overflow through DNS parser High 8.4
• CVE-2026-40892 PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() High 8.1

Sources

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

Also known as ALPINE-CVE-2026-33069, DEBIAN-CVE-2026-33069, GHSA-x5pq-qrp4-fmrj, UBUNTU-CVE-2026-33069.