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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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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