BREW-OPENCLAW-CLI-CVE-20… (GHSA-P536-VVPP-9MC8)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:21 – Updated: 2026-10-04 10:42 – Source website
VLAI
Summary
OpenClaw has a Web Fetch DoS via unbounded response parsing
Details

Summary

The web_fetch tool could be used to crash the OpenClaw Gateway process (OOM / resource exhaustion) by fetching and attempting to parse attacker-controlled web pages with oversized response bodies or pathological HTML nesting.

Affected Packages / Versions

  • Package: openclaw (npm)
  • Affected versions: <= 2026.2.14
  • Fixed versions: >= 2026.2.15

Impact

An attacker can social-engineer a user (or any automation that uses web_fetch) into fetching a malicious URL that returns extremely large or deeply nested HTML. The Gateway may exhaust memory or become unresponsive, causing a denial of service.

Fix

The Gateway now caps the downloaded response body size before any HTML parsing and adds additional guards to avoid running Readability/DOM parsing on pathological HTML.

Fix Commit(s)

  • 166cf6a3e04c7df42bea70a7ad5ce2b9df46d147

Release Process Note

This advisory is prepared for the next npm release. Once openclaw@2026.2.15 is published, publish this advisory without further edits.

Thanks @xuemian168 for reporting.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "2026.2.15"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "openclaw-cli",
        "purl": "pkg:brew/openclaw-cli"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2026.1.29"
            },
            {
              "fixed": "2026.2.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "npm",
        "key": "pkg:npm/openclaw@2026.9.8",
        "name": "openclaw",
        "strategy": "registry",
        "subject_version": "2026.9.8"
      }
    ]
  },
  "details": "### Summary\nThe `web_fetch` tool could be used to crash the OpenClaw Gateway process (OOM / resource exhaustion) by fetching and attempting to parse attacker-controlled web pages with oversized response bodies or pathological HTML nesting.\n\n### Affected Packages / Versions\n- Package: `openclaw` (npm)\n- Affected versions: `\u003c= 2026.2.14`\n- Fixed versions: `\u003e= 2026.2.15`\n\n### Impact\nAn attacker can social-engineer a user (or any automation that uses `web_fetch`) into fetching a malicious URL that returns extremely large or deeply nested HTML. The Gateway may exhaust memory or become unresponsive, causing a denial of service.\n\n### Fix\nThe Gateway now caps the downloaded response body size before any HTML parsing and adds additional guards to avoid running Readability/DOM parsing on pathological HTML.\n\n### Fix Commit(s)\n- 166cf6a3e04c7df42bea70a7ad5ce2b9df46d147\n\n### Release Process Note\nThis advisory is prepared for the next npm release. Once `openclaw@2026.2.15` is published, publish this advisory without further edits.\n\nThanks @xuemian168 for reporting.",
  "id": "BREW-openclaw-cli-CVE-2026-28394",
  "modified": "2026-10-04T10:42:18Z",
  "published": "2026-08-13T17:21:32Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-p536-vvpp-9mc8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/releases/tag/v2026.2.15"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenClaw has a Web Fetch DoS via unbounded response parsing",
  "upstream": [
    "GHSA-p536-vvpp-9mc8",
    "CVE-2026-28394"
  ]
}



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