GHSA-F269-VFMQ-VJVJ

Vulnerability from github – Published: 2026-03-13 20:07 – Updated: 2026-03-13 20:07
VLAI?
Summary
Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client
Details

Impact

A server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process.

Patches

Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Workarounds

There are no workarounds.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "undici"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.24.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "undici"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.24.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-1528"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284",
      "CWE-248"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-13T20:07:26Z",
    "nvd_published_at": "2026-03-12T21:16:25Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici\u0027s ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. \n\n### Patches\n\n\n Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.\n\n### Workarounds\n\nThere are no workarounds.",
  "id": "GHSA-f269-vfmq-vjvj",
  "modified": "2026-03-13T20:07:26Z",
  "published": "2026-03-13T20:07:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1528"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3537648"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nodejs/undici"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Undici: Malicious WebSocket 64-bit length overflows parser and crashes the client"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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