PT-2026-26131 · Giflib · Giflib

Zakka · Published 2026-01-01 · Updated 2026-05-18 · CVE-2026-26740

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions giflib version 5.2.2

Description A buffer overflow issue exists in giflib version 5.2.2. This flaw is due to the EGifGCBToExtension function overwriting an existing Graphic Control Extension block without validating its allocated size. This can lead to a denial of service.

Recommendations Update giflib to a newer version that addresses this issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

ALSA-2026:9693

BDU:2026-06618

CLEANSTART-2026-CQ39708

CLEANSTART-2026-DV49899

CLEANSTART-2026-OQ84658

CVE-2026-26740

ECHO-72CE-97FD-D225

RHSA-2026:9254

RHSA-2026:9686

RHSA-2026:9693

Affected Products

Giflib

References · 62

• 🔥 https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-48924 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-32289 · Security Note
• https://errata.almalinux.org/9/ALSA-2026-9693.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-31344 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-32283 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-26740 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-9693.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-26740 · Security Note
• https://osv.dev/vulnerability/CLEANSTART-2026-DV49899 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-26740 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-26740 · Vendor Advisory
• https://osv.dev/vulnerability/CLEANSTART-2026-OQ84658 · Vendor Advisory
• https://osv.dev/vulnerability/CLEANSTART-2026-CQ39708 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:9693 · Vendor Advisory