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                debian-lts@lists.debian.org     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.

Detections

Analytics

Debian dla-4650 : giflib-tools - security update

high Nessus Plugin ID 322947

Version 1.2

Version 1.1

Version 1.2 Jul 2, 2026, 3:38 PM CVSS metrics ("CVSSv3 score" set to 7.0) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H") CVSSv3 score source (set to "CVE-2026-23868") Plugin Feed: 202607021538
Version 1.1 Jun 26, 2026, 4:08 PM New Plugin Feed: 202606261608