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.
No advisories yet.
Solution
No solution given by the vendor.
Workaround
For SSL users: * Do not enable OCSP validation setting (current default is {stapling, no_staple}) * Use CRL-based revocation checking by setting the {crl_check, true} SSL option instead For applications using public_key:pkix_ocsp_validate/5 directly: * Pass {is_trusted_responder_fun, Fun} option with a function that validates trusted responder certificates * Restrict OCSP responder access to trusted endpoints via network controls (only applicable if you control the OCSP infrastructure)
Tue, 07 Apr 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | OCSP designated-responder authorization bypass via missing signature verification | |
| First Time appeared |
Erlang
Erlang erlang\/otp |
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| Weaknesses | CWE-295 | |
| CPEs | cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Erlang
Erlang erlang\/otp |
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| References |
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|
| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-04-07T14:38:03.763Z
Reserved: 2026-03-10T22:37:29.212Z
Link: CVE-2026-32144
Updated: 2026-04-07T13:15:16.503Z
Status : Awaiting Analysis
Published: 2026-04-07T13:16:46.570
Modified: 2026-04-07T13:20:11.643
Link: CVE-2026-32144
No data.
OpenCVE Enrichment
No data.