CVE-2026-26740

Publication date 18 March 2026

Last updated 30 June 2026

Ubuntu priority

Cvss 3 Severity Score

Description

Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its allocated size.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
giflib	26.04 LTS resolute	Vulnerable
	25.10 questing	Vulnerable
	24.04 LTS noble	Vulnerable
	22.04 LTS jammy	Vulnerable
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable

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/061605081115bbfd7019bafc119a13b6f17fcf25/

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.2 · High

Base metrics

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

Scores

Parameter	Value
Base score	8.2 · High
Exploitability score	-
Impact score	-

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