CVE-2026-26740

HIGH

giflib 5.2.2 - Denial of Service via EGifGCBToExtension Graphic Control Extension Overwrite

Title source: llm

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.

References (1)

Core 1

Core References

https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md

View Exploit ZIP pw:eip

Scores

CVSS v3 8.2

EPSS 0.0032

EPSS Percentile 23.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-787

Status published

Products (1)

giflib_project/giflib 5.2.2

Published Mar 18, 2026

Tracked Since Mar 19, 2026