Vulnerability · Published Jun 16, 2026 · Assigned by VulnCheck

CVE-2026-53859OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency

Medium 6.5

In plain English

A medium-severity server-side request forgery in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 88.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	openclaw	2026.5.26	GHSA-gxg4-2rrr-jhc7

Affected products (as reported)

Vendor	Product	Versions
OpenClaw	OpenClaw	0 – before 2026.5.26

Weakness: CWE-1023, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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