GHSA-97R2-QH9M-474H

Vulnerability from github – Published: 2026-10-28 21:17 – Updated: 2026-10-28 21:17
VLAI
Summary
Seroval: fromJSON deserializer trusts node-supplied array length and sequence doneAt (unauthenticated event-loop DoS)
Details

Summary

fromJSON and fromCrossJSON used two node fields without checking them.

  • An array node's element list was not checked to be an array. A small payload could set the length the decoder looped over. This part is also tracked in GHSA-wp97-x4hv-qvhp.
  • A sequence node's done index was not checked. A crafted value produced an iterator that never finished.

Impact

A service that passes untrusted input to fromJSON or fromCrossJSON can be made unavailable by an unauthenticated request.

  • The array case blocks the thread while the decoder runs.
  • The sequence case makes any code that reads the resulting iterator to the end run forever.

Patches

Fixed in seroval@1.6.8.

  • Element lists must be arrays.
  • A sequence node's throw and done indices must be integers from -1 up to the last element index.

Invalid input throws SerovalMalformedNodeError.

Workarounds

None. Upgrade to 1.6.8.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.6.7"
      },
      "package": {
        "ecosystem": "npm",
        "name": "seroval"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-116581"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1284",
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-28T21:17:27Z",
    "nvd_published_at": "2026-10-26T21:18:15Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\n`fromJSON` and `fromCrossJSON` used two node fields without checking them.\n\n- An array node\u0027s element list was not checked to be an array. A small payload could set the length the decoder looped over. This part is also tracked in GHSA-wp97-x4hv-qvhp.\n- A sequence node\u0027s done index was not checked. A crafted value produced an iterator that never finished.\n\n### Impact\n\nA service that passes untrusted input to `fromJSON` or `fromCrossJSON` can be made unavailable by an unauthenticated request.\n\n- The array case blocks the thread while the decoder runs.\n- The sequence case makes any code that reads the resulting iterator to the end run forever.\n\n### Patches\n\nFixed in `seroval@1.6.8`.\n\n- Element lists must be arrays.\n- A sequence node\u0027s throw and done indices must be integers from -1 up to the last element index.\n\nInvalid input throws `SerovalMalformedNodeError`.\n\n### Workarounds\n\nNone. Upgrade to 1.6.8.",
  "id": "GHSA-97r2-qh9m-474h",
  "modified": "2026-10-28T21:17:27Z",
  "published": "2026-10-28T21:17:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116581"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lxsmnsyc/seroval"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8"
    }
  ],
  "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": "Seroval: fromJSON deserializer trusts node-supplied array length and sequence doneAt (unauthenticated event-loop DoS)"
}



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