CVE-2026-26740

HIGH 8.2

CVSS Score

8.2

EPSS Score

0.6%

EPSS Percentile

46th

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.

Vendor	n/a
Product	n/a
Published	Mar 18, 2026
Last Updated	Jul 23, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-26740 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2448747 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26740.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33447 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:9689 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:9693 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33502 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33503 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:9683 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:9686 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33450 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33455 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33456 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33509 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33452 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33451 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:33501 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36004 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36005 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36006