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TI-2026-21451 Aliases CVE-2026-26967

PJSIP has a Heap-based Buffer Overflow vulnerability in its H.264 unpacketizer

Priority MEDIUM 43CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

PJSIP is a free and open source multimedia communication library written in C. In versions 2.16 and below, there is a critical Heap-based Buffer Overflow vulnerability in PJSIP's H.264 unpacketizer. The bug occurs when processing malformed SRTP packets, where the unpacketizer reads a 2-byte NAL unit size field without validating that both bytes are within the payload buffer bounds. The vulnerability affects applications that receive video using H.264. A patch is available at https://github.com/pjsip/pjproject/commit/f821c214e52b11bae11e4cd3c7f0864538fb5491.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pjsippjproject< f821c21—No fix listedCNA
  • pjproject Vendorpjsip Affected < f821c21 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pjsip:pjsip:*:*:*:*:*:*:*:*before 2.17Vulnerablepjsip
  • cpe:2.3:a:pjsip:pjsip:*:*:*:*:*:*:*:* Versions before 2.17 Vulnerable ·pjsip

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26967

References

Patch 2

  • TI-2022-08599 Potential out-of-bound read/write in PJSIP CVSS 3.1CRITICAL 9.8
  • TI-2026-21009 PJSIP has a heap buffer overflow in ICE with long username CVSS 4.0HIGH 8.1
  • TI-2022-18621 Buffer overflow in pjlib scanner and pjmedia CVSS 3.1CRITICAL 9.8
  • TI-2026-29548 PJSIP: Stack buffer overflow in pjsip_auth_create_digest2() CVSS 4.0HIGH 8.1
  • TI-2026-23213 PJSIP: Stack buffer overflow in Opus codec parser CVSS 4.0HIGH 8.7
  • TI-2026-22993 PJSIP: Heap use-after-free in PJSIP presence subscription termination handler CVSS 4.0HIGH 8.7
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences