CVE-2026-26740

Estado: ModificadaAlta (8.2)—
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

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Puntuación base: 8.2
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.03%
Percentil entre todas las CVEs puntuadas: 63
Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
ExplotaciónT1190 Exploit Public-Facing Applicationinitial access90 %
Impacto principalT1499.004 Application or System Exploitationimpact85 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact60 %
Vector CVSS:3.1 con AV:N/AC:L/PR:N/UI:N indica explotación remota sin privilegios (T1190). Buffer overflow en giflib permite DoS (T1499.004) y corrupción de datos (T1565.001) al sobrescribir bloques GCE sin validar tamaño (CWE-787).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Network Segmentation
Tecnologías afectadas (1)

Giflib Project — Giflib
CWE

CWE-787
CWE-787
Referencias

JSON original (NVD)

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