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

What is CVE-2026-53859?

CVE-2026-53859 is a medium-severity server-side request forgery vulnerability in Openclaw Openclaw, published on 16 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

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.

Weakness: CWE-918, CWE-1023

Which versions are affected by CVE-2026-53859?

2 open source packages ship an affected version, including openclaw. It affects 1 product.

Products include Openclaw Openclaw.

How do I fix CVE-2026-53859?

Upgrade openclaw to 2026.5.26 or later.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-53859 being exploited?

There is no known exploitation of CVE-2026-53859 in the wild and no public exploit code.

Other vulnerabilities in Openclaw Openclaw

• CVE-2026-28363 Security feature bypass in OpenClaw Critical 9.9
• CVE-2026-30741 Code injection in n/a Critical 9.8
• CVE-2026-33579 OpenClaw < 2026.3.28 - Privilege Escalation via Missing Caller Scope Validation in Device Pair Approval Critical 9.4
• CVE-2026-32922 OpenClaw < 2026.3.11 - Privilege Escalation via Unvalidated Scope in device.token.rotate Critical 9.4
• CVE-2026-32978 OpenClaw < 2026.3.11 - Approval Bypass via Unrecognized Script Runners Critical 9.4

All Openclaw Openclaw vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gxg4-2rrr-jhc7, MINI-7x3m-pmcc-2237.