Vulnerability Details CVE-2026-26740
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 45.9%
CVSS Severity
CVSS v3 Score 8.2
References
- https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md
- https://access.redhat.com/errata/RHSA-2026:33447
- https://access.redhat.com/errata/RHSA-2026:33450
- https://access.redhat.com/errata/RHSA-2026:33451
- https://access.redhat.com/errata/RHSA-2026:33452
- https://access.redhat.com/errata/RHSA-2026:33455
- https://access.redhat.com/errata/RHSA-2026:33456
- https://access.redhat.com/errata/RHSA-2026:33501
- https://access.redhat.com/errata/RHSA-2026:33502
- https://access.redhat.com/errata/RHSA-2026:33503
- https://access.redhat.com/errata/RHSA-2026:33509
- https://access.redhat.com/errata/RHSA-2026:36004
- https://access.redhat.com/errata/RHSA-2026:36005
- https://access.redhat.com/errata/RHSA-2026:36006
- https://access.redhat.com/errata/RHSA-2026:9683
- https://access.redhat.com/errata/RHSA-2026:9686
- https://access.redhat.com/errata/RHSA-2026:9689
- https://access.redhat.com/errata/RHSA-2026:9693
- https://access.redhat.com/security/cve/CVE-2026-26740
- https://bugzilla.redhat.com/show_bug.cgi?id=2448747
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26740.json
Products affected by CVE-2026-26740
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cpe:2.3:a:giflib_project:giflib:5.2.2