How severe is CVE-2026-35633?

CVE-2026-35633 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-2026-35633 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35633?

CVE-2026-35633 affects Openclaw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35633?

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

Does CVE-2026-35633 have an EU (EUVD) identifier?

Yes. CVE-2026-35633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21122.

When was CVE-2026-35633 published?

CVE-2026-35633 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-35633

CVE-2026-35633 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21122
Weakness: CWE-770
Affected product: Openclaw
Published: 2026-04-09
Last modified: 2026-06-17

Description

OpenClaw before 2026.3.22 contains an unbounded memory allocation vulnerability in remote media HTTP error handling that allows attackers to trigger excessive memory consumption. Attackers can send crafted HTTP error responses with large bodies to remote media endpoints, causing the application to allocate unbounded memory before failure handling occurs.

Frequently asked questions

What is CVE-2026-35633?: OpenClaw before 2026.3.22 contains an unbounded memory allocation vulnerability in remote media HTTP error handling that allows attackers to trigger excessive memory consumption. Attackers can send crafted HTTP error responses with large bodies to remote media endpoints, causing the application to allocate unbounded memory before failure handling occurs.
How severe is CVE-2026-35633?: CVE-2026-35633 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-2026-35633 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35633?: CVE-2026-35633 affects Openclaw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35633 have an EU (EUVD) identifier?: Yes. CVE-2026-35633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21122.
When was CVE-2026-35633 published?: CVE-2026-35633 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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