Is CVE-2026-53859 in the CISA KEV catalog?

No. CVE-2026-53859 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-53859?

CVE-2026-53859 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-53859?

CVE-2026-53859 has an EPSS score of 0.21% (11th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53859?

Upgrade openclaw to 2026.5.26 or later.

CVE & CISA-KEV Catalog

CVE-2026-53859

MEDIUM

6.5

CVSS v3

NVD

Description

OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.

CWE-918Server-Side Request Forgery (SSRF)CWE-1023

How to fix

Remediation Available

openclawNVD

Affected:< 2026.5.26Fixed in:2026.5.26CVE-2026-53859derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.21%probability of exploitation in 30 days

11thpercentile

Low risk: more likely to be exploited than 11% of all known CVEs.

References

Vendor Advisory1

github.com

Third-Party Advisory1

vulncheck.com

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.