UBUNTU-CVE-2026-26203

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Source
https://ubuntu.com/security/CVE-2026-26203
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26203.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-26203
Upstream
Published
2026-02-19T20:25:00Z
Modified
2026-04-22T16:27:33.658559Z
Severity
  • 5.1 (Medium) CVSS_V4 - 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 Calculator
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the issue.

References

Affected packages

Ubuntu:Pro:16.04:LTS / pjproject

Package

Name
pjproject
Purl
pkg:deb/ubuntu/pjproject@2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.1.0.0.ast20130823-1
2.1.0.0.ast20130823-1+deb8u1build0.16.04.1
2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpj2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjlib-util2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-audiodev2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-codec2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-videodev2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjmedia2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjnath2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjsip-simple2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjsip-ua2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjsip2"
        },
        {
            "binary_version": "2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1",
            "binary_name": "libpjsua2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26203.json"

Ubuntu:Pro:18.04:LTS / pjproject

Package

Name
pjproject
Purl
pkg:deb/ubuntu/pjproject@2.7.2~dfsg-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.6~dfsg-2
2.7~dfsg-1
2.7.1~dfsg-1
2.7.1~dfsg-1build1
2.7.2~dfsg-1
2.7.2~dfsg-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpj2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjlib-util2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-audiodev2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-codec2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjmedia-videodev2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjmedia2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjnath2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjsip-simple2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjsip-ua2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjsip2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjsua2"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "libpjsua2-2v5"
        },
        {
            "binary_version": "2.7.2~dfsg-1ubuntu0.1~esm1",
            "binary_name": "python-pjproject"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26203.json"