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[USN-7924-1] libpng vulnerabilities

Posted on 11 December 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7924-1
December 11, 2025

libpng1.6 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in libpng.

Software Description:
- libpng1.6: PNG (Portable Network Graphics) file library

Details:

It was discovered that libpng incorrectly handled memory when processing
certain PNG files, which could result in an out-of-bounds memory access.
If a user or automated system were tricked into opening a specially
crafted PNG file, an attacker could use this issue to cause libpng to
crash, resulting in a denial of service. (CVE-2025-64505)

It was discovered that libpng incorrectly handled memory when processing
8-bit images through the simplified write API with 'convert_to_8bit'
enabled, which could result in an out-of-bounds memory access. If a user
or automated system were tricked into opening a specially crafted 8-bit
PNG file, an attacker could use this issue to cause libpng to crash,
resulting in a denial of service. (CVE-2025-64506)

It was discovered that libpng incorrectly handled memory when processing
palette images with 'PNG_FLAG_OPTIMIZE_ALPHA' enabled, which could result
in an out-of-bounds memory access. If a user or automated system were
tricked into opening a specially crafted PNG file, an attacker could use
this issue to cause libpng to crash, resulting in a denial of service.
(CVE-2025-64720)

It was discovered that libpng incorrectly handled memory when processing
6-bit interlaced PNGs with 8-bit output format, which could result in an
out-of-bounds memory access. If a user or automated system were tricked
into opening a specially crafted PNG file, an attacker could use this
issue to cause libpng to crash, resulting in a denial of service.
(CVE-2025-65018)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
libpng16-16t64 1.6.50-1ubuntu0.1

Ubuntu 25.04
libpng16-16t64 1.6.47-1.1ubuntu0.1

Ubuntu 24.04 LTS
libpng16-16t64 1.6.43-5ubuntu0.1

Ubuntu 22.04 LTS
libpng16-16 1.6.37-3ubuntu0.1

Ubuntu 20.04 LTS
libpng16-16 1.6.37-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libpng16-16 1.6.34-1ubuntu0.18.04.2+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libpng16-16 1.6.20-2ubuntu0.1~esm2
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7924-1
CVE-2025-64505, CVE-2025-64506, CVE-2025-64720, CVE-2025-65018

Package Information:
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.50-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.47-1.1ubuntu0.1
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.43-5ubuntu0.1
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.37-3ubuntu0.1

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