ESB-2026.7114

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.7114 giflib security update 29 June 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: giflib Publisher: Debian Operating System: Debian GNU/Linux Resolution: Patch/Upgrade CVE Names: CVE-2026-23868 CVE-2026-26740 Original Bulletin: https://lists.debian.org/debian-lts-announce/2026/06/msg00039.html Comment: CVSS (Max): 8.2 CVE-2026-26740 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H) CVSS Source: CISA-ADP Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H EPSS (Max): 0.3% (23rd) CVE-2026-26740 2026-06-28 - --------------------------BEGIN INCLUDED TEXT-------------------- ------------------------------------------------------------------------- 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 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================