CVE-2026-26007
Estado: ModificadaAlta (8.2)—
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() and load_pem_public_key() functions do not verify that the point belongs to the expected prime-order subgroup of the curve. This missing validation allows an attacker to provide a public key point P from a small-order subgroup.
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This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victim_private_key]P via ECDH, this leaks information about victim_private_key mod (small_subgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup. Only SECT curves are impacted by this. This vulnerability is fixed in 46.0.5.
CVSS
- Versión: 4.0
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/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: 8.2
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.35%
- Percentil entre todas las CVEs puntuadas: 26
- 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
T1212Exploitation for Credential Accesscredential access85 % - Impacto secundario
T1565.003Runtime Data Manipulationimpact70 %
Vulnerabilidad en librería criptográfica expuesta en red (validación ausente en funciones públicas), permite fuga de claves privadas ECDH y falsificación de firmas ECDSA mediante puntos de suborden pequeño.
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-354
Referencias
- https://github.com/pyca/cryptography/commit/0eebb9dbb6343d9bc1d91e5a2482ed4e054a6d8c
- https://github.com/pyca/cryptography/security/advisories/GHSA-r6ph-v2qm-q3c2
- http://www.openwall.com/lists/oss-security/2026/02/10/4
- https://access.redhat.com/errata/RHSA-2026:10184
- https://access.redhat.com/errata/RHSA-2026:12176
- 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-2026:19355
- 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-2026:22993
- https://access.redhat.com/errata/RHSA-2026:2694
- https://access.redhat.com/errata/RHSA-2026:5168
- https://access.redhat.com/errata/RHSA-2026:5665
- https://access.redhat.com/errata/RHSA-2026:6308
- https://access.redhat.com/errata/RHSA-2026:6309
- https://access.redhat.com/errata/RHSA-2026:6497
- https://access.redhat.com/errata/RHSA-2026:6567
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:7295
- https://access.redhat.com/security/cve/CVE-2026-26007
- https://bugzilla.redhat.com/show_bug.cgi?id=2438762
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26007.json
JSON original (NVD)
Mostrar
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"value": "cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 46.0.5, the public_key_from_numbers (or EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() and load_pem_public_key() functions do not verify that the point belongs to the expected prime-order subgroup of the curve. This missing validation allows an attacker to provide a public key point P from a small-order subgroup. This can lead to security issues in various situations, such as the most commonly used signature verification (ECDSA) and shared key negotiation (ECDH). When the victim computes the shared secret as S = [victim_private_key]P via ECDH, this leaks information about victim_private_key mod (small_subgroup_order). For curves with cofactor > 1, this reveals the least significant bits of the private key. When these weak public keys are used in ECDSA , it's easy to forge signatures on the small subgroup. Only SECT curves are impacted by this. This vulnerability is fixed in 46.0.5."
},
{
"lang": "es",
"value": "Criptografía es un paquete diseñado para exponer primitivas criptográficas y recetas a los desarrolladores de Python. Antes de la versión 46.0.5, las funciones public_key_from_numbers (o EllipticCurvePublicNumbers.public_key()), EllipticCurvePublicNumbers.public_key(), load_der_public_key() y load_pem_public_key() no verifican que el punto pertenezca al subgrupo de orden primo esperado de la curva. Esta validación faltante permite a un atacante proporcionar un punto P de clave pública de un subgrupo de orden pequeño. Esto puede llevar a problemas de seguridad en varias situaciones, como la verificación de firma (ECDSA) y la negociación de clave compartida (ECDH) más comúnmente utilizadas. Cuando la víctima calcula el secreto compartido como S = [victim_private_key]P a través de ECDH, esto filtra información sobre victim_private_key mod (orden_subgrupo_pequeño). Para curvas con cofactor > 1, esto revela los bits menos significativos de la clave privada. Cuando estas claves públicas débiles se utilizan en ECDSA, es fácil falsificar firmas en el subgrupo pequeño. Solo las curvas SECT se ven afectadas por esto. Esta vulnerabilidad está corregida en la versión 46.0.5."
}
],
"lastModified": "2026-09-10T13:17:55.693",
"configurations": [
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"nodes": [
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"sourceIdentifier": "security-advisories@github.com"
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