UBUNTU-CVE-2026-33416

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Source
https://ubuntu.com/security/CVE-2026-33416
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33416.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-33416
Upstream
Published
2026-03-26T17:16:00Z
Modified
2026-04-22T20:36:17.569105Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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 1.2.1 through 1.6.55, png_set_tRNS and png_set_PLTE each alias a heap-allocated buffer between png_struct and png_info, sharing a single allocation across two structs with independent lifetimes. The trans_alpha aliasing has been present since at least libpng 1.0, and the palette aliasing since at least 1.2.1. Both affect all prior release lines png_set_tRNS sets png_ptr->trans_alpha = info_ptr->trans_alpha (256-byte buffer) and png_set_PLTE sets info_ptr->palette = png_ptr->palette (768-byte buffer). In both cases, calling png_free_data (with PNG_FREE_TRNS or PNG_FREE_PLTE) frees the buffer through info_ptr while the corresponding png_ptr pointer remains dangling. Subsequent row-transform functions dereference and, in some code paths, write to the freed memory. A second call to png_set_tRNS or png_set_PLTE has the same effect, because both functions call png_free_data internally before reallocating the info_ptr buffer. 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-2026-33416.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-2026-33416.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-2026-33416.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-2026-33416.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-2026-33416.json"
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.20-2ubuntu0.1~esm3?arch=source&distro=esm-apps/xenial

Affected ranges

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

Affected versions

1.*
1.6.20-2
1.6.20-2ubuntu0.1~esm1
1.6.20-2ubuntu0.1~esm2
1.6.20-2ubuntu0.1~esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng16-16",
            "binary_version": "1.6.20-2ubuntu0.1~esm3"
        },
        {
            "binary_name": "libpng16-devtools",
            "binary_version": "1.6.20-2ubuntu0.1~esm3"
        },
        {
            "binary_name": "libpng16-tools",
            "binary_version": "1.6.20-2ubuntu0.1~esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33416.json"
Ubuntu:Pro:18.04:LTS
libpng1.6

Package

Name
libpng1.6
Purl
pkg:deb/ubuntu/libpng1.6@1.6.34-1ubuntu0.18.04.2+esm2?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

1.*
1.6.34-1
1.6.34-1ubuntu0.18.04.1
1.6.34-1ubuntu0.18.04.2
1.6.34-1ubuntu0.18.04.2+esm1
1.6.34-1ubuntu0.18.04.2+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libpng-tools",
            "binary_version": "1.6.34-1ubuntu0.18.04.2+esm2"
        },
        {
            "binary_name": "libpng16-16",
            "binary_version": "1.6.34-1ubuntu0.18.04.2+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33416.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-2026-33416.json"