rustls 0.23.45 fixes TLS 1.3 handshake encryption-level validation

{
  "id": "cbfc9094d947b924739061e2d3a34a1d85ba43924dfc9c709f52291ee09406e7",
  "url": "https://github.com/rustls/rustls/releases/tag/v%2F0.23.45",
  "method": "llm",
  "payload": {
    "kind": "patch",
    "title": "rustls 0.23.45 fixes TLS 1.3 handshake encryption-level validation",
    "summary": "rustls 0.23.45 addresses acceptance of TLS 1.3 handshake messages at the wrong encryption level. The issue affects rustls 0.23.13 through 0.23.44 inclusive; the announcement says a network-position attacker cannot use it to alter or complete a handshake.",
    "evidence": "Ensure handshake \"alignment\" check covers previously-received messages",
    "products": [
      {
        "name": {
          "value": "rustls",
          "evidence": "This issue affects rustls versions 0.23.13 through 0.23.44 inclusive."
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0.23.45",
            "evidence": "Release notes from rustls\n0.23.45"
          }
        ],
        "affected_versions": [
          {
            "value": "0.23.13 through 0.23.44 inclusive",
            "evidence": "This issue affects rustls versions 0.23.13 through 0.23.44 inclusive."
          }
        ]
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "github-rustls-rustls",
  "document_id": 22563,
  "published_at": "2026-09-14T15:10:16+00:00"
}