CVE-2026-53859

MEDIUM 6.5

OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-1023 CWE-918
Vendor	openclaw
Product	openclaw
Published	Jun 16, 2026
Last Updated	Jun 16, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

OpenClaw / OpenClaw

0 < 2026.5.26

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7 vulncheck.com: https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency

Credits

🔍 Chinmohan Nayak (@nayakchinmohan)