Medium severity · published Jun 16, 2026
CVE-2026-53859
OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency
6.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.5.26 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53859
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53859
Vendor Advisory
https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency
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