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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/zakkanijia/POC/blob/main/giflib/giftool/giflib_giftool_gce_len_heap_oobwrite_disclosure.md	Exploit Third Party Advisory
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

Configurations

Configuration 1 (hide)

cpe:2.3:a:giflib_project:giflib:5.2.2:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-18 18:16

Updated : 2026-07-23 12:17

NVD link : CVE-2026-26740

Mitre link : CVE-2026-26740

CVE.ORG link : CVE-2026-26740

JSON object : View

Products Affected

giflib_project

giflib

CWE

CWE-787

Out-of-bounds Write

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validating its allocated size."}, {"lang": "es", "value": "Vulnerabilidad de desbordamiento de b\u00fafer en giflib v.5.2.2 permite a un atacante remoto causar una denegaci\u00f3n de servicio a trav\u00e9s de EGifGCBToExtension sobrescribiendo un bloque de extensi\u00f3n de control gr\u00e1fico existente sin validar su tama\u00f1o asignado."}], "lastModified": "2026-07-23T12:17:15.660", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:giflib_project:giflib:5.2.2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CC3B1EB3-6B22-4CA4-8BBA-7AB8A754FAB2"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}