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Ubuntu 25.10 libpng Critical DoS Crash Vulnerability USN-8039-1

ubuntu
Calendar Grey February 12, 2026
Dist Ubuntu Esm H88
Critical libpng issue could lead to crashes if malicious PNG files are opened. Update recommended for Ubuntu users.
libpng could be made to crash if it opened a specially crafted file.

Summary

libpng could be made to crash if it opened a specially crafted file.

Software Description:

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

Details:

It was discovered that the libpng simplified API incorrectly handled

quantizing RGB images. 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.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu vulnerability libpng

Update Instructions

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

Ubuntu 25.10
  libpng16-16t64                  1.6.50-1ubuntu0.4

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

Ubuntu 22.04 LTS
  libpng16-16                     1.6.37-3ubuntu0.4

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

References

https://ubuntu.com/security/notices/USN-8039-1

CVE-2026-25646

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8039-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu vulnerability libpng

Package Information

https://launchpad.net/ubuntu/+source/libpng1.6/1.6.50-1ubuntu0.4

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