CVE-2026-23868

Publication date 10 March 2026

Last updated 6 August 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Giflib contains a double-free vulnerability that is the result of a shallow copy in GifMakeSavedImage and incorrect error handling. The conditions needed to trigger this vulnerability are difficult but may be possible.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
giflib	26.04 LTS resolute	Fixed 5.2.2-1ubuntu3.2
	25.10 questing	Ignored end of life, was needed
	24.04 LTS noble	Fixed 5.2.2-1ubuntu1.2
	22.04 LTS jammy	Fixed 5.1.9-2ubuntu0.3
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable

Notes

mdeslaur

The commit listed below zeroes out sp->ExtensionBlockCount but then never updates it again, causing a regression.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
giflib	Upstream: https://sourceforge.net/p/giflib/code/ci/f5b7267aed3665ef025c13823e454170d031c106

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.1 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	None
Availability impact	High

Scores

Parameter	Value
Base score	5.1 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-8583-1
GIFLIB vulnerabilities
22 July 2026

Other references

https://www.cve.org/CVERecord?id=CVE-2026-23868