CVE-2026-53859: OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist

Routine

MEDIUM 6.5UPGRADE

CVE-2026-53859 is a medium-severity flaw (CVSS 6.5) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-918, CWE-1023
Published	2026-06-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-16 19:17 UTCPublished CVE record published
2026-06-17 22:12 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.5.26 · 2026.5.26 beta1 · 2026.5.26 beta2

Fixed in: 2026.5.26

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.5.26

npm install openclaw@">=2026.5.26"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53859?

openclaw: upgrade to 2026.5.26. Exact commands for each OS are on this page.

Is CVE-2026-53859 being exploited?

CVE-2026-53859 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53859 affect?

CVE-2026-53859 affects openclaw. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-53859?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2026-53855 HIGH 8.1 UPGRADE OpenClaw before 2026.4.2 contains an inline-eval bypass vulnerability allowing authenticated operators to weak
CVE-2026-53857 HIGH 8.1 UPGRADE OpenClaw before 2026.5.3 contains a policy enforcement vulnerability where Zalo contacts with mutable display
CVE-2026-53851 MEDIUM 5.3 UPGRADE OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter
CVE-2026-53846 HIGH 7.1 UPGRADE OpenClaw before 2026.4.29 contains a path traversal vulnerability in the install helper that allows workspace
CVE-2026-59261 HIGH 7.1 UPGRADE OpenClaw before 2026.5.28 contains a credential exposure vulnerability where workspace dotenv files can overri

References

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