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Ubuntu 25.10 libpng Critical DoS Vulnerabilities USN-8251-1 CVE-2026-33416

ubuntu
Calendar Grey May 7, 2026
Dist Ubuntu Esm H88
Serious libpng issues fixed in Ubuntu impacting security and system stability. Update recommended immediately.
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 libpng incorrectly handled memory when processing

certain PNG files. 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, or possibly execute

arbitrary code. (CVE-2026-33416)

It was discovered that libpng incorrectly handled expanding 8-bit paletted

rows to RGB or RGBA on ARM processors. 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, or

possibly execute arbitrary code. (CVE-2026-33636)

It was discovered that libpng incorrectly handled certain setter APIs. An

attacker could possibly use this issue to obtain sensitive information.

(CVE-2026-34757)

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu vulnerability libpng

Update Instructions

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

Ubuntu 25.10
  libpng16-16t64                  1.6.50-1ubuntu0.5

Ubuntu 24.04 LTS
  libpng16-16t64                  1.6.43-5ubuntu0.6

Ubuntu 22.04 LTS
  libpng16-16                     1.6.37-3ubuntu0.5

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

References

https://ubuntu.com/security/notices/USN-8251-1

CVE-2026-33416, CVE-2026-33636, CVE-2026-34757

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8251-1

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu vulnerability libpng

Package Information

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

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