GHSA-W2CG-VXX6-5XJG

Vulnerability from github – Published: 2026-02-18 00:52 – Updated: 2026-03-06 01:03
VLAI?
Summary
OpenClaw: denial of service through large base64 media files allocating large buffers before limit checks
Details

Summary

Base64-backed media inputs could be decoded into Buffers before enforcing decoded-size budgets. An attacker supplying oversized base64 payloads can force large allocations, causing memory pressure and denial of service.

Attack Scenario Notes

  • Recommended deployments bind the gateway to loopback by default and require gateway auth for HTTP endpoints. In that configuration, this is best modeled as a local/authorized DoS.
  • If an operator exposes the gateway to untrusted networks (or disables/weakens auth and rate limits), treat this as a higher-severity network DoS risk.

Affected Packages / Versions

  • openclaw (npm): <= 2026.2.13
  • clawdbot (npm): <= 2026.1.24-3

Fixed In

  • openclaw (npm): 2026.2.14 (planned)
  • clawdbot (npm): no patched release planned; migrate to openclaw

Fix Commit(s)

  • 31791233d60495725fa012745dde8d6ee69e9595

Credits

Thanks @vincentkoc for reporting.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.2.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "clawdbot"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2026.1.24-3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29612"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-18T00:52:36Z",
    "nvd_published_at": "2026-03-05T22:16:24Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nBase64-backed media inputs could be decoded into Buffers before enforcing decoded-size budgets. An attacker supplying oversized base64 payloads can force large allocations, causing memory pressure and denial of service.\n\n## Attack Scenario Notes\n\n- Recommended deployments bind the gateway to loopback by default and require gateway auth for HTTP endpoints. In that configuration, this is best modeled as a local/authorized DoS.\n- If an operator exposes the gateway to untrusted networks (or disables/weakens auth and rate limits), treat this as a higher-severity network DoS risk.\n\n## Affected Packages / Versions\n\n- openclaw (npm): \u003c= 2026.2.13\n- clawdbot (npm): \u003c= 2026.1.24-3\n\n## Fixed In\n\n- openclaw (npm): 2026.2.14 (planned)\n- clawdbot (npm): no patched release planned; migrate to openclaw\n\n## Fix Commit(s)\n\n- 31791233d60495725fa012745dde8d6ee69e9595\n\n## Credits\nThanks @vincentkoc for reporting.",
  "id": "GHSA-w2cg-vxx6-5xjg",
  "modified": "2026-03-06T01:03:12Z",
  "published": "2026-02-18T00:52:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-w2cg-vxx6-5xjg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29612"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/31791233d60495725fa012745dde8d6ee69e9595"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/releases/tag/v2026.2.14"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-large-base-media-file-decoding"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenClaw: denial of service through large base64 media files allocating large buffers before limit checks"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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