{
  "cveId": "CVE-2026-26311",
  "url": "https://patchblox.com/security/cve/CVE-2026-26311",
  "summary": "CVE-2026-26311 is fixed in ecs-service-connect-agent on 1 platform by ALAS2023-2026-1532 (version v1.34.13.0-1.amzn2023), released March 30, 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. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, a logic vulnerability in Envoy\u0027s HTTP connection manager (FilterManager) that allows for Zombie Stream Filter Execution. This issue creates a \u0022Use-After-Free\u0022 (UAF) or state-corruption window where filter callbacks are invoked on an HTTP stream that has already been logically reset and cleaned up. The vulnerability resides in source/common/http/filter_manager.cc within the FilterManager::decodeData method. The ActiveStream object remains valid in memory during the deferred deletion window. If a DATA frame arrives on this stream immediately after the reset (e.g., in the same packet processing cycle), the HTTP/2 codec invokes ActiveStream::decodeData, which cascades to FilterManager::decodeData. FilterManager::decodeData fails to check the saw_downstream_reset_ flag. It iterates over the decoder_filters_ list and invokes decodeData() on filters that have already received onDestroy(). Thi\u2026",
  "published": "2026-03-30T09:00:00Z",
  "severity": "important",
  "epss": 0.00391,
  "epssPercentile": 0.33709,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "ecs-service-connect-agent",
      "release": "amzn 2023",
      "fixedVersion": "v1.34.13.0-1.amzn2023",
      "fix": "ALAS2023-2026-1532",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1532",
      "released": "2026-03-30T09:00:00Z"
    }
  ],
  "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"
  }
}