Debian dla-4650 : giflib-tools - security update

high Nessus Plugin ID 322947

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4650 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4650-1 [email protected] https://www.debian.org/lts/security/ Tobias Frost June 26, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : giflib Version : 5.1.9-2+deb11u1 $bookworm_VERSION CVE ID : CVE-2026-23868 CVE-2026-26740 Debian Bug : 1130495 1131368

Two vulnerabilties have been found in giflib, a package of portable tools and library routines for working with GIF images, potentially allowing Denial of Service.

CVE-2026-23868

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.

CVE-2026-26740

A 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.

For Debian 11 bullseye, these problems have been fixed in version 5.1.9-2+deb11u1.

We recommend that you upgrade your giflib packages.

For the detailed security status of giflib please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/giflib

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the giflib-tools packages.

Plugin Details

Severity: High

ID: 322947

File Name: debian_DLA-4650.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 6/26/2026

Updated: 6/26/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:C

CVSS Score Source: CVE-2026-26740

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libgif7, p-cpe:/a:debian:debian_linux:libgif-dev, p-cpe:/a:debian:debian_linux:giflib-tools

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/26/2026

Vulnerability Publication Date: 3/10/2026

Reference Information

CVE: CVE-2026-23868, CVE-2026-26740

Detections

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