{"id":"CVE-2026-53859","aliases":["GHSA-gxg4-2rrr-jhc7"],"url":"https://o3.security/vulnerability/CVE-2026-53859","summary":"OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency","details":"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":"2026-06-16T18:05:06.511Z","modified":"2026-08-17T03:55:03.073764342Z","cvss":null,"epss":{"score":0.0021,"percentile":0.11364,"asOf":"2026-09-12"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.5.26"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53859.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53859"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-17T03:55:03.073764342Z"}}