{
  "cveId": "CVE-2025-64527",
  "url": "https://patchblox.com/security/cve/CVE-2025-64527",
  "summary": "CVE-2025-64527 is fixed in ecs-service-connect-agent on 1 platform by ALAS2023-2025-1357 (version v1.34.4.2-1.amzn2023), released January 7, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ecs-service-connect-agent: Envoy is a high-performance edge/middle/service proxy",
  "description": "Envoy is a high-performance edge/middle/service proxy. In 1.33.12, 1.34.10, 1.35.6, 1.36.2, and earlier, Envoy 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. This is caused by a re-entry bug in the JwksFetcherImpl. When the first token\u0027s JWKS fetch fails, onJwksError() callback triggers processing of the second token, which calls fetch() again on the same fetcher object. The original callback\u0027s reset() then clears the second fetch\u0027s state (receiver_ and request_) which causes a crash when the async HTTP response arrives.",
  "published": "2026-01-07T18:41:00Z",
  "severity": "important",
  "epss": 0.00564,
  "epssPercentile": 0.47324,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ecs-service-connect-agent",
      "release": "amzn 2023",
      "fixedVersion": "v1.34.4.2-1.amzn2023",
      "fix": "ALAS2023-2025-1357",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2025-1357",
      "released": "2026-01-07T18:41:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}