VDB-360019 · CVE-2026-42427 · GHSA-7437-7hg8-frrw

OpenClaw up to 2026.4.7 Environment Variable incomplete blacklist

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in OpenClaw up to 2026.4.7. Affected by this vulnerability is an unknown functionality of the component Environment Variable Handler. This manipulation of the argument HGRCPATH/CARGO_BUILD_RUSTC_WRAPPER/RUSTC_WRAPPER/MAKEFLAGS causes incomplete blacklist. The identification of this vulnerability is CVE-2026-42427. The attack can only be executed locally. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in OpenClaw up to 2026.4.7. Affected by this vulnerability is some unknown functionality of the component Environment Variable Handler. The manipulation of the argument HGRCPATH/CARGO_BUILD_RUSTC_WRAPPER/RUSTC_WRAPPER/MAKEFLAGS with an unknown input leads to a incomplete blacklist vulnerability. The CWE definition for the vulnerability is CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OpenClaw before 2026.4.8 contains a remote code execution vulnerability caused by missing environment variable denylist entries for HGRCPATH, CARGO_BUILD_RUSTC_WRAPPER, RUSTC_WRAPPER, and MAKEFLAGS. Attackers can inject malicious build tool environment variables to influence host exec commands and achieve arbitrary code execution.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-42427 since 04/27/2026. The exploitation appears to be difficult. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1562.006 according to MITRE ATT&CK.

Upgrading to version 2026.4.8 eliminates this vulnerability. Applying the patch d7c3210cd6f5fdfdc1beff4c9541673e814354d5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-26129). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Artificial Intelligence Software

Name

OpenClaw

Version

License

open-source

Website

Product: https://github.com/openclaw/openclaw/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (VulnCheck): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Incomplete blacklist
CWE: CWE-184 / CWE-183 / CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenClaw 2026.4.8
Patch: d7c3210cd6f5fdfdc1beff4c9541673e814354d5

Timelineinfo

04/27/2026 CVE reserved
04/28/2026 +1 days Advisory disclosed
04/28/2026 +0 days VulDB entry created
04/29/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-7437-7hg8-frrw
Status: Confirmed

CVE: CVE-2026-42427 (🔒)
GCVE (CVE): GCVE-0-2026-42427
GCVE (VulDB): GCVE-100-360019
EUVD: 🔒

Entryinfo

Created: 04/28/2026 21:56
Updated: 04/29/2026 02:42
Changes: 04/28/2026 21:56 (80), 04/29/2026 02:42 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.