{
  "cveId": "CVE-2026-55962",
  "url": "https://patchblox.com/security/cve/CVE-2026-55962",
  "summary": "CVE-2026-55962 is fixed in wolfssl on 1 platform, first by DEBIAN-CVE-2026-55962, released July 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "wolfssl: TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client\u0027s Finished message without the...",
  "description": "TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client\u0027s Finished message without the client having sent a Certificate and CertificateVerify. The post-handshake-auth exemption that allows an empty/absent peer certificate was only intended for the initial handshake, but it was also being applied while a post-handshake CertificateRequest was still outstanding. The check is now scoped to the initial handshake only: on the server, once a post-handshake CertificateRequest has been sent (certReqCtx is set), a peer certificate and a valid CertificateVerify are required again before the Finished is accepted, with empty-certificate handling following the configured verify mode (FAIL_IF_NO_PEER_CERT) just as during first-handshake client authentication. Only affects TLS 1.3 servers built with post-handshake authentication support (WOLFSSL_POST_HANDSHAKE_AUTH / --enable-postauth, included in --enable-all) that enable WOLFSSL_VERIFY_POST_HANDSHAKE and request a client certificate after the handshake via wolfSSL_request_certificate(). Clients, and servers that do not use post-handshake authentication, are unaffected.",
  "published": "2026-06-25T22:17:02Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
  "epss": 0.00235,
  "epssPercentile": 0.14505,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "wolfssl",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.5.4-2\u002Bdeb12u3",
      "fix": "DEBIAN-CVE-2026-55962",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-55962",
      "released": "2026-07-18T12:42:52Z"
    },
    {
      "platform": "linux",
      "product": "wolfssl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.7.2-0.1\u002Bdeb13u2",
      "fix": "DEBIAN-CVE-2026-55962",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-55962",
      "released": "2026-07-18T12:42:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}