CVE-2026-32597
Estado: ModificadaAlta (7.5)—
PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.28%
- Percentil entre todas las CVEs puntuadas: 19
- Fecha de la puntuación: 5/10/2026
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.
- Explotación
T1190Exploit Public-Facing Applicationinitial access75 % - Impacto principal
T1078Valid Accountsstealth · persistence · privilege escalation · initial access80 % - Impacto secundario
T1553.002Code Signingdefense impairment75 %
Token validation bypass en librería remota (AV:N, PR:N) permite aceptar JWS inválidos. Atacante remoto puede falsificar credenciales o eludir verificación de integridad sin interacción.
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
Tecnologías afectadas (1)
CWE
- CWE-345, CWE-863
- CWE-347
Referencias
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f
- https://lists.debian.org/debian-lts-announce/2026/05/msg00008.html
- https://access.redhat.com/errata/RHSA-2026:10140
- https://access.redhat.com/errata/RHSA-2026:10141
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:12176
- https://access.redhat.com/errata/RHSA-2026:13508
- https://access.redhat.com/errata/RHSA-2026:13512
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:13553
- https://access.redhat.com/errata/RHSA-2026:13672
- https://access.redhat.com/errata/RHSA-2026:13916
- https://access.redhat.com/errata/RHSA-2026:17083
- https://access.redhat.com/errata/RHSA-2026:19138
- https://access.redhat.com/errata/RHSA-2026:19355
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:21431
- https://access.redhat.com/errata/RHSA-2026:21517
- https://access.redhat.com/errata/RHSA-2026:22330
- https://access.redhat.com/errata/RHSA-2026:24977
- https://access.redhat.com/errata/RHSA-2026:26226
- https://access.redhat.com/errata/RHSA-2026:37275
- https://access.redhat.com/errata/RHSA-2026:42644
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:6720
- https://access.redhat.com/errata/RHSA-2026:6912
- https://access.redhat.com/errata/RHSA-2026:6926
- https://access.redhat.com/errata/RHSA-2026:8437
- https://access.redhat.com/errata/RHSA-2026:8746
- https://access.redhat.com/errata/RHSA-2026:8747
- https://access.redhat.com/errata/RHSA-2026:8748
- https://access.redhat.com/security/cve/CVE-2026-32597
- https://bugzilla.redhat.com/show_bug.cgi?id=2447194
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32597.json
JSON original (NVD)
Mostrar
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"value": "PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0."
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"value": "PyJWT es una implementación de JSON Web Token en Python. Antes de la 2.12.0, PyJWT no valida el parámetro de encabezado crit (Crítico) definido en la RFC 7515 §4.1.11. Cuando un token JWS contiene un array crit que lista extensiones que PyJWT no entiende, la biblioteca acepta el token en lugar de rechazarlo. Esto viola el requisito MUST en la RFC. Esta vulnerabilidad está corregida en la 2.12.0."
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