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Ubuntu 26.04 GIFLIB Critical Denial of Service 2026-23868

ubuntu
Calendar Grey July 22, 2026
Scroller Ubuntu
GIFLIB on Ubuntu could crash or run programs due to crafted GIF files, risking denial of service or code execution.
GIFLIB could be made to crash or run programs if it opened a specially crafted file.

Summary

GIFLIB could be made to crash or run programs if it opened a specially

crafted file.

Software Description:

- giflib: library for GIF images

Details:

It was discovered that GIFLIB incorrectly handled certain GIF image files.

If a user or automated system were tricked into opening a specially crafted

GIF file, a remote attacker could use this issue to cause GIFLIB to crash,

resulting in a denial of service, or possibly execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu giflib

Update Instructions

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

Ubuntu 26.04 LTS
  giflib-tools                    5.2.2-1ubuntu3.2
  libgif7                         5.2.2-1ubuntu3.2

Ubuntu 24.04 LTS
  giflib-tools                    5.2.2-1ubuntu1.2
  libgif7                         5.2.2-1ubuntu1.2

Ubuntu 22.04 LTS
  giflib-tools                    5.1.9-2ubuntu0.3
  libgif7                         5.1.9-2ubuntu0.3

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

References

https://ubuntu.com/security/notices/USN-8583-1

CVE-2026-23868, CVE-2026-26740

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8583-1

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu giflib

Package Information

https://launchpad.net/ubuntu/+source/giflib/5.2.2-1ubuntu3.2
https://launchpad.net/ubuntu/+source/giflib/5.2.2-1ubuntu1.2
https://launchpad.net/ubuntu/+source/giflib/5.1.9-2ubuntu0.3

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