Vulnerability-Lookup

GHSA-MJ59-H3Q9-GHFH

Vulnerability from github – Published: 2026-04-25 23:48 – Updated: 2026-05-19 15:56

Summary

OpenClaw: MCP stdio server env could load dangerous startup variables from workspace config

Details

Affected Packages / Versions

Package: openclaw (npm)
Affected versions: < 2026.4.20
Patched version: 2026.4.20

Impact

Workspace MCP stdio configuration could pass dangerous process-startup environment variables such as NODE_OPTIONS, LD_PRELOAD, or BASH_ENV to the spawned MCP server process. In a malicious workspace, this could make the MCP child load attacker-controlled code when the operator starts a session that uses that MCP server.

The impact is limited to local/workspace trust boundaries and requires the operator to run OpenClaw in a workspace containing the malicious MCP configuration. Severity is therefore medium, not high/critical.

Fix

OpenClaw now filters MCP stdio environment entries through the host environment safety denylist before spawning stdio MCP servers.

Fix commits:

62fa5071896e95edc7f67d1cebc70a2859e283af
85d86ebc4bf3d2226d39d132a484f4f7a299fa1b

Release

Fixed in OpenClaw 2026.4.20.

Severity

5.4 (Medium)


                  
                    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.4.20"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44995"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-427",
      "CWE-454",
      "CWE-829"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-25T23:48:03Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `\u003c 2026.4.20`\n- Patched version: `2026.4.20`\n\n## Impact\n\nWorkspace MCP stdio configuration could pass dangerous process-startup environment variables such as `NODE_OPTIONS`, `LD_PRELOAD`, or `BASH_ENV` to the spawned MCP server process. In a malicious workspace, this could make the MCP child load attacker-controlled code when the operator starts a session that uses that MCP server.\n\nThe impact is limited to local/workspace trust boundaries and requires the operator to run OpenClaw in a workspace containing the malicious MCP configuration. Severity is therefore medium, not high/critical.\n\n## Fix\n\nOpenClaw now filters MCP stdio environment entries through the host environment safety denylist before spawning stdio MCP servers.\n\nFix commits:\n\n- `62fa5071896e95edc7f67d1cebc70a2859e283af`\n- `85d86ebc4bf3d2226d39d132a484f4f7a299fa1b`\n\n## Release\n\nFixed in OpenClaw `2026.4.20`.",
  "id": "GHSA-mj59-h3q9-ghfh",
  "modified": "2026-05-19T15:56:20Z",
  "published": "2026-04-25T23:48:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-mj59-h3q9-ghfh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44995"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/62fa5071896e95edc7f67d1cebc70a2859e283af"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/commit/85d86ebc4bf3d2226d39d132a484f4f7a299fa1b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/openclaw-arbitrary-code-execution-via-mcp-stdio-environment-variables"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenClaw: MCP stdio server env could load dangerous startup variables from workspace config"
}

CVE-2026-44995 (GCVE-0-2026-44995)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:46 – Updated: 2026-05-11 17:57 X_Open Source

Title

OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables

Summary

OpenClaw before 2026.4.20 contains an improper environment variable validation vulnerability in MCP stdio server configuration that allows attackers to execute arbitrary code. Malicious workspace configurations can pass dangerous startup variables like NODE_OPTIONS, LD_PRELOAD, or BASH_ENV to spawned MCP server processes, enabling code injection when operators start sessions using those servers.

Severity

5.4 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.3 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/openclaw/openclaw/security/adv…	vendor-advisory
https://github.com/openclaw/openclaw/commit/62fa5…	patch
https://github.com/openclaw/openclaw/commit/85d86…	patch
https://www.vulncheck.com/advisories/openclaw-arb…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
OpenClaw	OpenClaw	Affected: 0 , < 2026.4.20 (semver) Unaffected: 2026.4.20 (semver)

Date Public

2026-04-21 00:00

Credits

Gus (@garagon)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

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