CVE-2026-53859

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

State: Published
Severity: 6.0 Medium
Published: Jun 16, 2026
Updated: Jun 16, 2026
Reserved: Jun 10, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-1023 Incomplete Comparison with Missing Factors
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
OpenClawOpenClaw	before 2026.5.26Affected 2026.5.26Not affected

References

GitHub Security Advisory (GHSA-gxg4-2rrr-jhc7)vendor-advisory
VulnCheck Advisory: OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistencythird-party-advisory

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