Medium
OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44995
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 19:08 UTC · Revision 1
Source evidence
OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables
core-osv · Original sourcePublished 11 May 2026, 16:46 UTC
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.
osv:CVE-2026-44995
Complete source record
{
"id": "4ad353e5d9fbe26601954eb7b921536f2b468507384d3c3f22525ac691c807f9",
"url": "https://osv.dev/vulnerability/CVE-2026-44995",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2026-44995",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-44995",
"aliases": [
"CVE-2026-44995",
"GHSA-mj59-h3q9-ghfh"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openclaw/openclaw",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "115f05d5952adeaa8043311c24c4b8a3803481ba"
},
{
"fixed": "62fa5071896e95edc7f67d1cebc70a2859e283af"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.4.20"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "62fa5071896e95edc7f67d1cebc70a2859e283af"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2026.4.19-beta.2",
"v2026.4.19-beta.1",
"v2026.4.15",
"v2026.4.15-beta.2",
"v2026.4.15-beta.1",
"v2026.4.14",
"v2026.4.14-beta.1",
"v2026.4.12",
"v2026.4.12-beta.1",
"v2026.4.11",
"v2026.4.11-beta.1",
"v2026.4.10",
"v2026.4.9",
"v2026.4.9-beta.1",
"v2026.4.8",
"v2026.4.7-1",
"v2026.4.7",
"v2026.4.5",
"v2026.4.2",
"v2026.4.1",
"v2026.4.1-beta.1",
"v2026.3.31",
"v2026.3.31-beta.1",
"v2026.3.28",
"v2026.3.28-beta.1",
"v2026.3.24",
"v2026.3.24-beta.2",
"v2026.3.24-beta.1",
"v2026.3.23-2",
"v2026.3.23",
"v2026.3.23-beta.1",
"v2026.3.22",
"v2026.3.22-beta.1",
"v2026.3.13-1",
"v2026.3.13",
"v2026.3.12",
"v2026.3.11",
"v2026.3.11-beta.1",
"v2026.3.8",
"v2026.3.8-beta.1",
"v2026.3.7",
"v2026.3.7-beta.1",
"v2026.3.2-beta.1",
"v2026.3.2",
"v2026.3.1",
"v2026.2.26",
"v2026.2.26-beta.1",
"v2026.2.25",
"v2026.2.25-beta.1",
"v2026.2.24",
"v2026.2.24-beta.1",
"v2026.2.23",
"v2026.2.23-beta.1",
"v2026.2.22",
"v2026.2.22-beta.1",
"v2026.2.21",
"v2026.2.21-beta.1",
"v2026.2.19-beta.1",
"v2026.2.19",
"v2026.2.17",
"v2026.2.15-beta.1",
"v2026.2.14",
"v2026.2.13",
"v2026.2.12",
"v2026.2.9",
"v2026.2.6-3",
"v2026.2.6-2",
"v2026.2.6-1",
"v2026.2.6",
"v2026.2.3",
"v2026.2.2",
"v2026.2.1",
"v2026.1.30",
"v2026.1.29",
"v2026.1.24-1",
"v2026.1.24",
"v2026.1.23",
"v2026.1.22",
"v2026.1.21",
"v2026.1.20",
"v2026.1.16-2",
"v2026.1.15",
"v2026.1.14-1",
"v2026.1.13",
"v2026.1.12-2",
"v2026.1.12",
"v2026.1.11-3",
"v2026.1.11-2",
"v2026.1.11-1",
"v2026.1.11",
"v2026.1.10",
"v2026.1.9",
"v2026.1.8",
"v2026.1.5-3",
"v2026.1.5-2",
"v2026.1.5-1",
"v2026.1.5",
"v2.0.0-beta5",
"v2.0.0-beta4",
"v2.0.0-beta3",
"v2.0.0-beta2",
"v2.0.0-beta1",
"v1.3.0",
"v1.2.2",
"v1.2.1",
"v1.2.0",
"v1.1.0",
"v1.0.4",
"v0.1.3",
"v0.1.2",
"v0.1.1",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44995.json"
}
}
],
"modified": "2026-10-28T02:30:48.087972814Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44995.json",
"https://github.com/openclaw/openclaw/security/advisories/GHSA-mj59-h3q9-ghfh",
"https://nvd.nist.gov/vuln/detail/CVE-2026-44995",
"https://www.vulncheck.com/advisories/openclaw-arbitrary-code-execution-via-mcp-stdio-environment-variables",
"https://github.com/openclaw/openclaw/commit/62fa5071896e95edc7f67d1cebc70a2859e283af",
"https://github.com/openclaw/openclaw/commit/85d86ebc4bf3d2226d39d132a484f4f7a299fa1b"
],
"provider_metadata": {
"cwe_ids": [
"CWE-829"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44995.json"
}
},
"related_cves": [
{
"value": "CVE-2026-44995",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 515945,
"published_at": "2026-05-11T16:46:35.083+00:00"
}