CVE-2026-32144 (GCVE-0-2026-32144)

Vulnerability from cvelistv5 – Published: 2026-04-07 12:28 – Updated: 2026-07-15 04:14
VLAI
Title
OCSP designated-responder authorization bypass via missing signature verification
Summary
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.
Severity
7.6 (High)
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
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
EEF
References
Impacted products
Vendor Product Version
Erlang OTP Affected: 1.16 , < * (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
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Erlang OTP Affected: 11.2 , < * (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
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Erlang OTP Affected: 27.0 , < * (otp)
Affected: 601a012837ea0a5c8095bf24223132824177124d , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
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Red Hat Red Hat OpenStack Platform 16.2     cpe:/a:redhat:openstack:16.2
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Red Hat Red Hat OpenStack Platform 17.1     cpe:/a:redhat:openstack:17.1
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Red Hat Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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Credits
Igor Morgenstern / Aisle Research Jakub Witczak Ingela Anderton Andin
Show details on NVD website
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Applications using the public_key:pkix_ocsp_validate/5 API directly are also affected, with impact depending on usage context.\\n\\nThis vulnerability is associated with program files lib/public_key/src/pubkey_ocsp.erl and program routines pubkey_ocsp:is_authorized_responder/3.\\n\\nThis 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 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\"pubkey_ocsp:is_authorized_responder/3\"}]}], \"references\": [{\"url\": \"https://github.com/erlang/otp/security/advisories/GHSA-gxrm-pf64-99xm\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-32144.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-32144\", \"tags\": [\"related\"]}, {\"url\": \"https://www.erlang.org/doc/system/versions.html#order-of-versions\", \"tags\": [\"x_version-scheme\"]}, {\"url\": \"https://github.com/erlang/otp/commit/ac7ff528be857c5d35eb29c7f24106e3a16d4891\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/erlang/otp/commit/49033a6d93a5be0ee0dce04e1fb8b4ae7de1e0c0\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"For SSL users:\\n\\n* Do not enable OCSP validation setting (current default is {stapling, no_staple})\\n* Use CRL-based revocation checking by setting the {crl_check, true} SSL option instead\\n\\nFor applications using public_key:pkix_ocsp_validate/5 directly:\\n\\n* Pass {is_trusted_responder_fun, Fun} option with a function that validates trusted responder certificates\\n* Restrict OCSP responder access to trusted endpoints via network controls (only applicable if you control the OCSP infrastructure)\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cb\u003eFor SSL users:\u003c/b\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003eDo not enable OCSP validation setting (current default is \u003ctt\u003e{stapling, no_staple}\u003c/tt\u003e)\u003c/li\u003e\u003cli\u003eUse CRL-based revocation checking by setting the \u003ctt\u003e{crl_check, true}\u003c/tt\u003e SSL option instead\u003c/li\u003e\u003c/ul\u003e\u003cp\u003e\u003cb\u003eFor applications using \u003ctt\u003epublic_key:pkix_ocsp_validate/5\u003c/tt\u003e directly:\u003c/b\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003ePass \u003ctt\u003e{is_trusted_responder_fun, Fun}\u003c/tt\u003e option with a function that validates trusted responder certificates\u003c/li\u003e\u003cli\u003eRestrict OCSP responder access to trusted endpoints via network controls (only applicable if you control the OCSP infrastructure)\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification.\\n\\nThe 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\u0027s issuer name matches the CA\u0027s 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.\\n\\nThis 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.\\n\\nThis vulnerability is associated with program files lib/public_key/src/pubkey_ocsp.erl and program routines pubkey_ocsp:is_authorized_responder/3.\\n\\nThis 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows OCSP designated-responder authorization bypass via missing signature verification.\u003cp\u003eThe OCSP response validation in \u003ctt\u003epublic_key:pkix_ocsp_validate/5\u003c/tt\u003e does not verify that a CA-designated responder certificate was cryptographically signed by the issuing CA. Instead, it only checks that the responder certificate\u0027s issuer name matches the CA\u0027s 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.\u003c/p\u003e\u003cp\u003eThis 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 \u003ctt\u003epublic_key:pkix_ocsp_validate/5\u003c/tt\u003e API directly are also affected, with impact depending on usage context.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/public_key/src/pubkey_ocsp.erl\u003c/tt\u003e and program routines \u003ctt\u003epubkey_ocsp:is_authorized_responder/3\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-295\", \"description\": \"CWE-295 Improper Certificate Validation\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"SSL/TLS must be configured with OCSP stapling enabled (e.g., {stapling, staple}), or the application must call public_key:pkix_ocsp_validate/5 directly. OCSP stapling is disabled by default ({stapling, no_staple}).\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"SSL/TLS must be configured with OCSP stapling enabled (e.g., \u003ctt\u003e{stapling, staple}\u003c/tt\u003e), or the application must call \u003ctt\u003epublic_key:pkix_ocsp_validate/5\u003c/tt\u003e directly. OCSP stapling is disabled by default (\u003ctt\u003e{stapling, no_staple}\u003c/tt\u003e).\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.10\", \"versionStartIncluding\": \"27.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.4.2\", \"versionStartIncluding\": \"28.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-07-15T04:14:22.245Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-32144\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-15T04:14:22.245Z\", \"dateReserved\": \"2026-03-10T22:37:29.212Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-04-07T12:28:00.767Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.