How severe is GHSA-mj59-h3q9-ghfh?

No CVSS score has been assigned to GHSA-mj59-h3q9-ghfh yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-mj59-h3q9-ghfh?

GHSA-mj59-h3q9-ghfh affects the following packages: openclaw (npm). Ecosystems affected: npm.

How do I fix GHSA-mj59-h3q9-ghfh?

Update openclaw to 2026.4.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mj59-h3q9-ghfh is resolved across your whole dependency graph.

How do I detect GHSA-mj59-h3q9-ghfh in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-mj59-h3q9-ghfh if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-mj59-h3q9-ghfh?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-mj59-h3q9-ghfh can be triaged on real exposure rather than presence alone.

Is GHSA-mj59-h3q9-ghfh actively exploited in the wild?

No public exploit code has been indexed for GHSA-mj59-h3q9-ghfh yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-mj59-h3q9-ghfh?

GHSA-mj59-h3q9-ghfh has an EPSS (Exploit Prediction Scoring System) score of 0.1%, placing it in the 3th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-mj59-h3q9-ghfh?

GHSA-mj59-h3q9-ghfh is classified as CWE-829 (CWE-829). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-mj59-h3q9-ghfh published, and has it been updated?

GHSA-mj59-h3q9-ghfh was published on April 25, 2026 and was last updated on May 19, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

GHSA-mj59-h3q9-ghfh — openclaw

Fix: openclaw/openclaw@62fa507

GHSA-mj59-h3q9-ghfh is a CWE-829 vulnerability in openclaw. A fix is available for openclaw — see the affected versions and patch details below.

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

Also known asCVE-2026-44995

Published

Apr 25, 2026

Updated

May 19, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-mj59-h3q9-ghfh.

EPSS Exploitation Probability

via FIRST.org ↗

0.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs3th percentile — riskier than 3% of all scored CVEsHighest risk

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

133other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

openclawnpm

2.5Mdownloads / week

Description

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`openclaw`	all versions	2026.4.20`npm install openclaw@2026.4.20`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openclaw, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update openclaw to 2026.4.20 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mj59-h3q9-ghfh is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-mj59-h3q9-ghfh can be triaged on real exposure rather than presence alone.

Tailored to GHSA-mj59-h3q9-ghfh. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

## 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 ma

O3 Security · Impact-Aware SCA

Is GHSA-mj59-h3q9-ghfh in your dependencies?

O3 Security finds GHSA-mj59-h3q9-ghfh across npm dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works