UBUNTU-CVE-2026-73639

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Source
https://ubuntu.com/security/CVE-2026-73639
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-73639
Upstream
Published
2026-09-17T22:17:00Z
Modified
2026-09-24T02:00:52Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Imager::File::PNG versions from 1.003 before 1.004 for Perl write past the end of the row buffer reading a PNG with a tRNS transparency chunk in read_direct8. With a tRNS chunk, read_direct8() adds an alpha channel to the image it creates but still sizes the row buffer from the original channel count. libpng expands the transparency into that extra channel, so png_read_row() fills one channel more than the buffer holds, at one byte per sample, and writes width bytes past the end of the allocation. Palette images go to read_paletted() and 16-bit images to read_direct16(), which sizes its buffer from png_get_rowbytes() and allocates enough for the expanded row. The same reader ships bundled in the Imager distribution. Reading an attacker-supplied PNG through Imager->read() corrupts the heap, which can crash the process.

References

Affected packages

Ubuntu:16.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.003+dfsg-1
1.004+dfsg-1
1.004+dfsg-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.004+dfsg-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"
Ubuntu:18.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.005+dfsg-2build1
1.006+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.006+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"
Ubuntu:20.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=focal

Affected ranges

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

Affected versions

1.*
1.011+dfsg-1
1.011+dfsg-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.011+dfsg-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"
Ubuntu:22.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.012+dfsg-1build1
1.012+dfsg-2
1.012+dfsg-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.012+dfsg-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"
Ubuntu:24.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.019+dfsg-2
1.020+dfsg-1
1.022+dfsg-1
1.023+dfsg-1
1.023+dfsg-1build1
1.023+dfsg-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.023+dfsg-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"
Ubuntu:26.04:LTS
libimager-perl

Package

Name
libimager-perl
Purl
pkg:deb/ubuntu/libimager-perl?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.027+dfsg-1
1.029+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libimager-perl",
            "binary_version": "1.029+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73639.json"