{
  "cveId": "CVE-2026-42791",
  "url": "https://patchblox.com/security/cve/CVE-2026-42791",
  "summary": "CVE-2026-42791 is fixed in 37 products on 1 platform, first by SUSE-SU-2026:22082-1, released June 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "erlang: Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP respon...",
  "description": "Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp module) allows forged OCSP responses signed with an expired responder certificate to be accepted as valid.  OCSP response verification in pubkey_ocsp:verify_response/5 and pubkey_ocsp:is_authorized_responder/3 in lib/public_key/src/pubkey_ocsp.erl does not check the validity period (notBefore/notAfter) of the OCSP responder certificate. An attacker who has obtained the private key of an expired CA-designated OCSP responder certificate can forge OCSP responses that Erlang/OTP accepts as valid.  This affects TLS clients using OCSP stapling via the ssl application: a malicious or compromised server can present a revoked TLS certificate together with a forged OCSP response signed by an expired responder key, and the client will accept the revoked certificate as valid. It also affects applications calling public_key:pkix_ocsp_validate/5 directly, where the impact depends on the use case \u2014 server-side client certificate validation using this API may allow authentication bypass with a revoked client certificate.  This issue affects OTP from OTP 27.0 before OTP\u00A029.0.1, OTP\u00A028.5.0.1 and OTP\u00A027.3.4.12, corresponding to public_key from 1.16 before 1.21.1, 1.20.3.1 and 1.17.1.3.",
  "published": "2026-05-27T07:16:00Z",
  "severity": "low",
  "cvss": 3.7,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.00316,
  "epssPercentile": 0.24678,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "release": "Debian 13.5 (trixie)",
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      "fix": "DEBIAN-CVE-2026-42791",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42791",
      "released": "2026-06-24T14:07:24Z"
    },
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      "release": "Debian 14",
      "fixedVersion": "1:27.3.4.12\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-42791",
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      "released": "2026-06-24T14:07:24Z"
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      "fix": "OPENSUSE-SU-2026:20907-1",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}