Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-mj59-h3q9-ghfh
Advisory ID github_osv/GHSA-mj59-h3q9-ghfh
Aliases CVE-2026-44995
Summary OpenClaw: MCP stdio server env could load dangerous startup variables from workspace config ## 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`.
Status Published
Exploitability 0.5
Weighted Severity 4.9
Risk 2.5
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-427 Uncontrolled Search Path Element
CWE-829 Inclusion of Functionality from Untrusted Control Sphere
CWE-454 External Initialization of Trusted Variables or Data Stores
System Score Found at
cvssv4 5.4 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mj59-h3q9-ghfh/GHSA-mj59-h3q9-ghfh.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/openclaw/openclaw
62fa5071896e95edc7f67d1cebc70a2859e283af Other https://github.com/openclaw/openclaw/commit/62fa5071896e95edc7f67d1cebc70a2859e283af
85d86ebc4bf3d2226d39d132a484f4f7a299fa1b Other https://github.com/openclaw/openclaw/commit/85d86ebc4bf3d2226d39d132a484f4f7a299fa1b
CVE-2026-44995 https://nvd.nist.gov/vuln/detail/CVE-2026-44995
GHSA-mj59-h3q9-ghfh Advisory https://github.com/openclaw/openclaw/security/advisories/GHSA-mj59-h3q9-ghfh
openclaw-arbitrary-code-execution-via-mcp-stdio-environment-variables Advisory https://www.vulncheck.com/advisories/openclaw-arbitrary-code-execution-via-mcp-stdio-environment-variables
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: 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 Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mj59-h3q9-ghfh/GHSA-mj59-h3q9-ghfh.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-05-11T17:56:23Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/44xxx/CVE-2026-44995.json

Source Advisory: vulnrichment/CVE-2026-44995

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]