How severe is CVE-2026-35626?

CVE-2026-35626 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-35626 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35626?

CVE-2026-35626 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35626?

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

Does CVE-2026-35626 have an EU (EUVD) identifier?

Yes. CVE-2026-35626 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21110.

When was CVE-2026-35626 published?

CVE-2026-35626 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-35626

CVE-2026-35626 is a medium-severity vulnerability in Openclaw with a CVSS 3.x base score of 5.3. 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-405.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21110
Weakness: CWE-405
Affected product: Openclaw
Published: 2026-04-09
Last modified: 2026-06-17

Description

OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.

Frequently asked questions

What is CVE-2026-35626?: OpenClaw before 2026.3.22 contains an unauthenticated resource exhaustion vulnerability in voice call webhook handling that buffers request bodies before provider signature checks. Attackers can send large or malicious webhook requests to exhaust server resources without authentication by bypassing signature validation.
How severe is CVE-2026-35626?: CVE-2026-35626 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-35626 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35626?: CVE-2026-35626 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35626?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35626 have an EU (EUVD) identifier?: Yes. CVE-2026-35626 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21110.
When was CVE-2026-35626 published?: CVE-2026-35626 was published on 2026-04-09 and last updated on 2026-06-17.

References

Affected products (1)

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

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