{"id":"CVE-2026-53839","title":"OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames","summary":"OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trust…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-1023"],"vendor":"openclaw","product":"openclaw","affected":["openclaw < 2026.5.7"],"patched":["openclaw 2026.5.7"],"published":"2026-06-12","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:20.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53839","references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-77q5-rr5v-x43q","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/openclaw-hostname-prefix-matching-bypass-in-trusted-retry-endpoint-validation","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-15T18:12:17.313642Z"},"epss":0.00461,"epssPercentile":0.37936,"ingestedAt":"2026-10-08T16:52:14.688Z","slug":"CVE-2026-53839","body":"## Overview\n\nOpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.\n\n## Affected\n\n- `openclaw < 2026.5.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `openclaw 2026.5.7`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}