Description (CNA)
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 before OTP 28.4.2 and OTP 27.3.4.10, corresponding to public_key from 1.16 before 1.20.3 and 1.17.1.2, and ssl from 11.2 before 11.5.4 and 11.2.12.7.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Erlang / OTP | affected 1.16 before * |
| Erlang / OTP | affected 11.2 before * |
| Erlang / OTP | affected 27.0 before *; affected 601a012837ea0a5c8095bf24223132824177124d before * |
CWE
CWE-295
References
- https://github.com/erlang/otp/security/advisories/GHSA-gxrm-pf64-99xm
- https://cna.erlef.org/cves/CVE-2026-32144.html
- https://osv.dev/vulnerability/EEF-CVE-2026-32144
- https://www.erlang.org/doc/system/versions.html#order-of-versions
- https://github.com/erlang/otp/commit/ac7ff528be857c5d35eb29c7f24106e3a16d4891
- https://github.com/erlang/otp/commit/49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in Erlang OTP public_key. This improper certificate validation vulnerability allows a remote attacker to bypass Online Certificate Status Protocol (OCSP) designated-responder authorization. The vulnerability stems from missing signature verification during OCSP response validation, enabling an attacker to forge responses that mark revoked certificates as valid. Consequently, clients may accept connections to compromised servers, potentially leading to the transmission of sensitive data.