CVE WatchJul 15, 2026

CVE-2026-32144

Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization b

CVSS

7.4

High

EPSS

0.2%

p10

KEV

—

Exploit Today

0-100

Published: Apr 7, 2026 · Last modified: Jul 15, 2026 · CWE-295 · CWE-347

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-06-302026-07-17

Technical description

Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification. The OCSP response validation in public_key:pkix_ocsp_validate/5 does not verify that a CA-designated responder certificate was cryptographically signed by the issuing CA. Instead, it only checks that the responder certificate's issuer name matches the CA's subject name and that the certificate has the OCSPSigning extended key usage. An attacker who can intercept or control OCSP responses can create a self-signed certificate with a matching issuer name and the OCSPSigning EKU, and use it to forge OCSP responses that mark revoked certificates as valid. This affects SSL/TLS clients using OCSP stapling, which may accept connections to servers with revoked certificates, potentially transmitting sensitive data to compromised servers. Applications using the public_key:pkix_ocsp_validate/5 API directly are also affected, with impact depending on usage context. This vulnerability is associated with program files lib/public_key/src/pubkey_ocsp.erl and program routines pubkey_ocsp:is_authorized_responder/3. This issue affects OTP from OTP 27.0 until OTP 28.4.2 and 27.3.4.10 corresponding to public_key from 1.16 until 1.20.3 and 1.17.1.2, and ssl from 11.2 until 11.5.4 and 11.2.12.7.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-4855810.0 CRI

63.6%

KEV—69SimpleHelp Authentication Bypass Vulnerability18d CVE-2023-278239.8 CRI

98.9%

——30An authentication bypass in Optoma 1080PSTX C02 allows an attacker to access the administration console without valid credentials.9d CVE-2026-403729.1 CRI

95.5%

——29Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.3d CVE-2026-290009.1 CRI

92.4%

——28pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.3d CVE-2022-477589.8 CRI

62.6%

——19Nanoleaf firmware v7.1.1 and below is missing TLS verification, allowing attackers to execute arbitrary code via a DNS hijacking attack.9d CVE-2026-54733—

56.1%

——17The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Active Directory integration for Moodle. Prior to 4.5.6, 5.0.5, and 5.1.1, the Microsoft Office 365 Integration plugin local_o365 Teams SSO endpoint sso_login.php base64-decodes a JWT payload and authenticates users from the upn claim without verifying the JWT signature, allowing an unauthenticated attacker to forge a token and obtain a Moodle session as an O365-authenticated user. This issue is fixed in versions 4.5.6, 5.0.5, and 5.1.1.2d