CVE-2026-53859: Openclaw

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Openclaw Openclaw: before 2026.5.26 (fixed in 2026.5.26); version 2026.5.26 only

Published 2026-06-16. Last modified 2026-06-17.