CVE-2025-64527: Github.com/envoyproxy/envoy Envoy Crashes When JWT Authentication Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mp85-7mrq-r866",
  "modified" : "2025-12-05T18:12:39Z",
  "published" : "2025-12-05T18:12:39Z",
  "aliases" : [ "CVE-2025-64527" ],
  "summary" : "Envoy crashes when JWT authentication is configured with the remote JWKS fetching",
  "details" : "### Summary\nEnvoy crashes when JWT authentication is configured with the remote JWKS fetching, `allow_missing_or_failed` is enabled, multiple JWT tokens are present in the request headers and the JWKS fetch fails.\n\n### Details\nThis is caused by a re-entry bug in the `JwksFetcherImpl`. When the first token's JWKS fetch fails, `onJwksError()` callback triggers processing of the second token, which calls fetch() again on the same fetcher object.\n\nThe original callback's reset() then clears the second fetch's state (`receiver_ and request_`) which causes a crash when the async HTTP response arrives.\n\n### PoC\n* `allow_missing_or_failed` or `allow_missing` is enabled\n* The client send 2 Authorization headers\n* the remote JWKS fetching failed\n* There will be crash\n\n### Impact\nDoS and Crash\n\n### Mitigation\n* Disable the `allow_missing_or_failed` or `allow_missing`",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/envoyproxy/envoy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.36.0"
      }, {
        "fixed" : "1.36.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.36.2"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/envoyproxy/envoy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.35.0"
      }, {
        "fixed" : "1.35.7"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.35.6"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/envoyproxy/envoy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.34.0"
      }, {
        "fixed" : "1.34.11"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.34.10"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/envoyproxy/envoy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.33.13"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.33.12"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/envoyproxy/envoy/security/advisories/GHSA-mp85-7mrq-r866"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-64527"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/envoyproxy/envoy"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-05T18:12:39Z",
    "nvd_published_at" : "2025-12-03T18:15:46Z"
  }
}