CVE-2026-128128

{
  "etk_id": "ETK-2026-3943",
  "cve_id": "CVE-2026-128128",
  "display_id": "CVE-2026-128128",
  "ghsa_id": "GHSA-3rp8-rxj8-mvjw",
  "euvd_id": "EUVD-2026-125760",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Integer overflow in aiohttp C WebSocket size validation",
  "summary": "aiohttp releases before 3.14.4 are affected when the C WebSocket reader is in use. A remote WebSocket peer can bypass the configured message-size limit and cause unbounded memory consumption, requiring access to a WebSocket endpoint handled by the affected reader.",
  "mitigation": "Upgrade aiohttp to version 3.14.4 or later. If an immediate upgrade is not possible, disable C extensions with `AIOHTTP_NO_EXTENSIONS=1` to use the unaffected Python reader.",
  "vendor": "pip",
  "product": "aiohttp",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 3.14.3"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "3.14.4"
      ],
      "package_name": "aiohttp",
      "purl": "pkg:pypi/aiohttp"
    }
  ],
  "cwes": [
    770
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 13.644396066666667,
  "t0_at": "2026-11-13T20:31:59.981000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-13T21:54:48.374705+00:00",
      "days": 0.05750455677083333,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T20:31:59.981000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-08T18:20:46+00:00",
      "days": -5.091134039351852,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T20:31:59.981000+00:00",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-3rp8-rxj8-mvjw"
    }
  }
}