UBUNTU-CVE-2026-33636

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Source
https://ubuntu.com/security/CVE-2026-33636
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-33636
Upstream
Published
2026-03-26T17:16:00Z
Modified
2026-04-22T20:36:12.459197Z
Severity
  • 7.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit paletted rows to RGB or RGBA, the Neon loop processes a final partial chunk without verifying that enough input pixels remain. Because the implementation works backward from the end of the row, the final iteration dereferences pointers before the start of the row buffer (OOB read) and writes expanded pixel data to the same underflowed positions (OOB write). This is reachable via normal decoding of attacker-controlled PNG input if Neon is enabled. Version 1.6.56 fixes the issue.

References

Affected packages

Ubuntu:22.04:LTS
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.37-3ubuntu0.4?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.6.37-3build4
1.6.37-3build5
1.6.37-3ubuntu0.1
1.6.37-3ubuntu0.3
1.6.37-3ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.37-3ubuntu0.4"
        },
        {
            "binary_name": "libpng16-16",
            "binary_version": "1.6.37-3ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"
Ubuntu:24.04:LTS
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.43-5ubuntu0.5?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.6.40-1
1.6.40-2
1.6.40-3
1.6.42-1
1.6.43-1
1.6.43-3
1.6.43-5build1
1.6.43-5ubuntu0.1
1.6.43-5ubuntu0.3
1.6.43-5ubuntu0.4
1.6.43-5ubuntu0.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.43-5ubuntu0.5"
        },
        {
            "binary_name": "libpng16-16t64",
            "binary_version": "1.6.43-5ubuntu0.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"
Ubuntu:25.10
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.50-1ubuntu0.4?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.6.47-1.1
1.6.48-1
1.6.49-1~exp1
1.6.50-1~exp1
1.6.50-1
1.6.50-1ubuntu0.1
1.6.50-1ubuntu0.3
1.6.50-1ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.50-1ubuntu0.4"
        },
        {
            "binary_name": "libpng16-16t64",
            "binary_version": "1.6.50-1ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"
Ubuntu:Pro:14.04:LTS
libpng

Package

Name
libpng
Purl
pkg:deb/ubuntu/libpng@1.2.50-1ubuntu2.14.04.3+esm1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

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

Affected versions

1.*
1.2.49-4ubuntu1
1.2.49-5ubuntu1
1.2.50-1ubuntu1
1.2.50-1ubuntu2
1.2.50-1ubuntu2.14.04.1
1.2.50-1ubuntu2.14.04.2
1.2.50-1ubuntu2.14.04.3
1.2.50-1ubuntu2.14.04.3+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng12-0",
            "binary_version": "1.2.50-1ubuntu2.14.04.3+esm1"
        },
        {
            "binary_name": "libpng3",
            "binary_version": "1.2.50-1ubuntu2.14.04.3+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"
Ubuntu:Pro:16.04:LTS
libpng

Package

Name
libpng
Purl
pkg:deb/ubuntu/libpng@1.2.54-1ubuntu1.1+esm2?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

1.*
1.2.51-0ubuntu3
1.2.54-1
1.2.54-1ubuntu1
1.2.54-1ubuntu1.1
1.2.54-1ubuntu1.1+esm1
1.2.54-1ubuntu1.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng12-0",
            "binary_version": "1.2.54-1ubuntu1.1+esm2"
        },
        {
            "binary_name": "libpng3",
            "binary_version": "1.2.54-1ubuntu1.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"
Ubuntu:Pro:20.04:LTS
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.37-2ubuntu0.1~esm2?arch=source&distro=esm-infra/focal

Affected ranges

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

Affected versions

1.*
1.6.37-1
1.6.37-2
1.6.37-2ubuntu0.1~esm1
1.6.37-2ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.37-2ubuntu0.1~esm2"
        },
        {
            "binary_name": "libpng16-16",
            "binary_version": "1.6.37-2ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33636.json"