How severe is CVE-2026-4039?

CVE-2026-4039 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4039?

CVE-2026-4039 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4039?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4039 have an EU (EUVD) identifier?

Yes. CVE-2026-4039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11563.

When was CVE-2026-4039 published?

CVE-2026-4039 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-4039

CVE-2026-4039 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 5.3
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11563
Weakness: CWE-74
Affected product: Openclaw
Published: 2026-03-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-4039?: CVE-2026-4039 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4039?: CVE-2026-4039 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4039?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4039 have an EU (EUVD) identifier?: Yes. CVE-2026-4039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11563.
When was CVE-2026-4039 published?: CVE-2026-4039 was published on 2026-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*

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