What is CVE-2026-4039?

CVE-2026-4039 is a medium-severity vulnerability in Openclaw, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-03-12.

How severe is CVE-2026-4039?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in Openclaw

CVE-2026-4039

A vulnerability was determined in OpenClaw 2026.2.19-2. This vulnerability affects the function applySkillConfigenvOverrides of the component Skill Env Handler. Executing a manipulation can lead to code injection. It is possible to launch the attack remotely. Upgrading to version 2026.2.21-beta.1 is able to resolve this issue. This patch is called 8c9f35cdb51692b650ddf05b259ccdd75cc9a83c. It is recommended to upgrade the affected component.

EPSS: 0.003 (24.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Openclaw
N/a Openclaw — versions 2026.2.19-2, 2026.2.21-beta.1

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (related, Mitigation, Vendor Advisory)
cna@vuldb.com (Patch, patch)
cna@vuldb.com (Release Notes, patch)
cna@vuldb.com (Product, product)

Frequently asked questions

What is CVE-2026-4039?: CVE-2026-4039 is a medium-severity vulnerability in Openclaw, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-03-12.
How severe is CVE-2026-4039?: Medium severity. CVSS v3 base score is 6.3 out of 10.