CVE-2026-42791
Gravedad CVSS v4.0:
MEDIA
Tipo:
CWE-295
Validación incorrecta de certificados
Fecha de publicación:
27/05/2026
Última modificación:
02/06/2026
Descripción
*** Pendiente de traducción *** Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP responses signed with an expired responder certificate to be accepted as valid.<br />
<br />
OCSP response verification in pubkey_ocsp:verify_response/5 and pubkey_ocsp:is_authorized_responder/3 in lib/public_key/src/pubkey_ocsp.erl does not check the validity period (notBefore/notAfter) of the OCSP responder certificate. An attacker who has obtained the private key of an expired CA-designated OCSP responder certificate can forge OCSP responses that Erlang/OTP accepts as valid.<br />
<br />
This affects TLS clients using OCSP stapling via the ssl application: a malicious or compromised server can present a revoked TLS certificate together with a forged OCSP response signed by an expired responder key, and the client will accept the revoked certificate as valid. It also affects applications calling public_key:pkix_ocsp_validate/5 directly, where the impact depends on the use case — server-side client certificate validation using this API may allow authentication bypass with a revoked client certificate.<br />
<br />
This issue affects OTP from OTP 27.0 before OTP 27.3.4.12, 28.5.0.1, and 29.0.1 corresponding to public_key from 1.16 before 1.17.1.3, 1.20.3.1, and 1.21.1.
Impacto
Puntuación base 4.0
6.30
Gravedad 4.0
MEDIA
Puntuación base 3.x
3.70
Gravedad 3.x
BAJA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* | 27.0 (incluyendo) | 27.3.4.12 (excluyendo) |
| cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* | 28.0 (incluyendo) | 28.5.0.1 (excluyendo) |
| cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* | 29.0 (incluyendo) | 29.0.1 (excluyendo) |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página
Referencias a soluciones, herramientas e información
- https://cna.erlef.org/cves/CVE-2026-42791.html
- https://github.com/erlang/otp/commit/7995f1fdaee3da569bb810358ce0f546471d169b
- https://github.com/erlang/otp/commit/b3870e02405c709a872b01ba6086065620cdfe76
- https://github.com/erlang/otp/security/advisories/GHSA-cjxj-wj6x-3fff
- https://osv.dev/vulnerability/EEF-CVE-2026-42791
- https://www.erlang.org/doc/system/versions.html#order-of-versions



