CVE-2026-26203

Application crash via invalid fragmented NAL state

Published Feb 19, 2026 · Updated Feb 19, 2026

Heap buffer underflow in Teluu pjmedia-video before 2.17 allows local users to crash H.264-sending applications via malformed bitstreams. In pjmedia_h264_packetize, a continuation-fragment path subtracts the configured MTU from nal_start and dereferences the resulting pointer without verifying that a preceding FU-A fragment exists. The path requires H.264 packetization other than single NAL, and the reported consequence is unexpected application termination.

CVSS severity6.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer underflow in Teluu pjmedia-video before 2.17 allows local users to crash H.264-sending applications via malformed bitstreams. In pjmedia_h264_packetize, a continuation-fragment path subtracts the configured MTU from nal_start and dereferences the resulting pointer without verifying that a preceding FU-A fragment exists. The path requires H.264 packetization other than single NAL, and the reported consequence is unexpected application termination.

The record

CVE
CVE-2026-26203
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
PJSIP
Product
pjmedia-video
Classifications
CWE-416
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

PJSIP · pjmedia-videoversion=< 2.17

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
5.1GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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