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Ubuntu 20.04 LTS libpng Critical DoS Vulnerabilities USN-8035-1 Update

ubuntu
Calendar Grey February 12, 2026
Dist Ubuntu Esm H88
Multiple critical security fixes for libpng in Ubuntu, addressing denial of service risks from multiple issues.
Several security issues were fixed in libpng.

Summary

Several security issues were fixed in libpng.

Software Description:

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

Details:

It was discovered that the libpng simplified API incorrectly processed

palette PNG images with partial transparency and gamma correction. 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-2025-66293)

Petr Simecek, Stanislav Fort and Pavel Kohout discovered that the libpng

simplified API incorrectly processed interlaced 16-bit PNGs with 8-bit

output format and non-minimal row strides. 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-2026-22695)

Cosmin Truta discovered that the libpng simplified API incorrectly handled

invalid row strides. If a user or automated system were tricked ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu libpng

Update Instructions

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

Ubuntu 20.04 LTS
  libpng16-16                     1.6.37-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libpng16-16                     1.6.34-1ubuntu0.18.04.2+esm2
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libpng16-16                     1.6.20-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8035-1

CVE-2025-66293, CVE-2026-22695, CVE-2026-22801, CVE-2026-25646

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8035-1

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu libpng

Package Information

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