CVE-2026-53859 | THREATINT

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.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-16 | Updated 2026-06-16 | Assigner VulnCheck

MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Problem types

Incomplete Comparison with Missing Factors

Server-Side Request Forgery (SSRF)

Product status

Default status

unaffected

Any version before 2026.5.26

affected

2026.5.26 (semver)

unaffected

Credits

Chinmohan Nayak (@nayakchinmohan) reporter

References

github.com/...enclaw/security/advisories/GHSA-gxg4-2rrr-jhc7 (GitHub Security Advisory (GHSA-gxg4-2rrr-jhc7)) vendor-advisory

www.vulncheck.com/...n-bypass-via-trailing-dot-inconsistency (VulnCheck Advisory: OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency) third-party-advisory

cve.org (CVE-2026-53859)

nvd.nist.gov (CVE-2026-53859)

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