CVE-2026-3338

Estado: ModificadaAlta (8.7)—

Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes.

Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.40%
Percentil entre todas las CVEs puntuadas: 32
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 access85 %
Impacto principalT1553.002 Code Signingdefense impairment90 %
Impacto secundarioT1565.002 Transmitted Data Manipulationimpact70 %

Validación de firma defectuosa en PKCS7_verify() accesible remotamente sin autenticación (AV:N/PR:N/UI:N) permite suplantación de código: bypass de verificación criptográfica (T1553.002) y potencial manipulación de datos firmados (T1565.002).

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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Encrypt Sensitive Information

Tecnologías afectadas (2)

Amazon — Aws-lc-sys Amazon — AWS Libcrypto

CWE

CWE-347
CWE-347

Referencias

JSON original (NVD)

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      "value": "Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes.\n\n\n\nCustomers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0."
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      "value": "La validación de firma incorrecta en PKCS7_verify() en AWS-LC permite a un usuario no autenticado eludir la verificación de firma al procesar objetos PKCS7 con atributos autenticados.\n\nLos clientes de los servicios de AWS no necesitan tomar ninguna medida. Las aplicaciones que utilizan AWS-LC deberían actualizarse a la versión 1.69.0 de AWS-LC."
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