# CVE-2026-53859

## Summary

- **CVE ID:** CVE-2026-53859
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1023, CWE-918
- **Published:** Jun 16, 2026
- **Last Modified:** Jun 16, 2026

## 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.

## Affected Products

- OpenClaw — OpenClaw (0)
- OpenClaw — OpenClaw (2026.5.26)

## References

- [CNA](https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7)
- [CNA](https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._