CVE-2026-44995 json
OpenClaw < 2026.4.20 - Arbitrary Code Execution via MCP stdio Environment Variables
published 6mo ago modified 4mo ago also GHSA-mj59-h3q9-ghfh , EUVD-2026-29140
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
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.
Patch / fix
- npm openclaw 2026.4.20
- OpenClaw OpenClaw 2026.4.20
Is CVE-2026-44995 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5mo ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.4 | 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 |
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 5.4 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | openclaw | <2026.4.20 |
2026.4.20 |
Affected products
- OpenClaw OpenClaw
Classification
References
-
github.com
/openclaw/openclaw/commit/62fa5071896e95edc7f67d1cebc70a2859e283af
patch, web
-
github.com
/openclaw/openclaw/commit/85d86ebc4bf3d2226d39d132a484f4f7a299fa1b
patch, web, broken-link
-
vulncheck.com
/advisories/openclaw-arbitrary-code-execution-via-mcp-stdio-environment-variables
third-party-advisory, web, patch
-
github.com
/openclaw/openclaw/security/advisories/GHSA-mj59-h3q9-ghfh
vendor-advisory, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-44995
advisory
-
github.com
/openclaw/openclaw
package
Sources
- CVE List CVE-2026-44995
- GitHub Advisory GHSA-mj59-h3q9-ghfh
- NVD CVE-2026-44995
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.