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Review reviewHigh

CVE-2026-32144

Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1

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...

CVSS
7.6
EPSS
0.20%
9.99% percentile
CISA KEV
Not listed
Published
2026.04.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.20%
Technical severityCVSS 7.6

Vulnerability overview

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...

Affected product and versions

Product
Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1
Affected versions
>= 1.16, >= 11.2, >= 27.0, >= 601a012837ea0a5c8095bf24223132824177124d, >= 27.0 < 27.3.4.10, >= 28.0 < 28.4.2, >= 1.16 < 1.17.1.2, >= 1.18 < 1.20.3, >= 11.2 < 11.2.12.7, > 11.3 < 11.5.4
Fixed versions
27.3.4.10, 28.4.2, 1.17.1.2, 1.20.3, 11.2.12.7, 11.5.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:L/SI:L/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
CWE
CWE-295, CWE-347