Medium
OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-53859
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 19:26 UTC · Revision 1
Source evidence
OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency
core-osv · Original sourcePublished 16 Jun 2026, 18:05 UTC
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.
osv:CVE-2026-53859
Complete source record
{
"id": "a88d60c0cebac505bddd00b6000434be5aff6bc1d5e0645fc96bd36d90180ba6",
"url": "https://osv.dev/vulnerability/CVE-2026-53859",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency",
"summary": "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.",
"evidence": "osv:CVE-2026-53859",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-53859",
"aliases": [
"CVE-2026-53859",
"GHSA-gxg4-2rrr-jhc7"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openclaw/openclaw",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "10ad3aa16068baa84a1bd9ac4f7d42ae725cedb7"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.5.26"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2026.5.26"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v2026.4.19-beta.2",
"v2026.4.19-beta.1",
"v2026.4.15",
"v2026.4.15-beta.2",
"v2026.4.15-beta.1",
"v2026.4.14",
"v2026.4.14-beta.1",
"v2026.4.12",
"v2026.4.12-beta.1",
"v2026.4.11",
"v2026.4.11-beta.1",
"v2026.4.10",
"v2026.4.9",
"v2026.4.9-beta.1",
"v2026.4.8",
"v2026.4.7-1",
"v2026.4.7",
"v2026.4.5",
"v2026.4.2",
"v2026.4.1",
"v2026.4.1-beta.1",
"v2026.3.31",
"v2026.3.31-beta.1",
"v2026.3.28",
"v2026.3.28-beta.1",
"v2026.3.24",
"v2026.3.24-beta.2",
"v2026.3.24-beta.1",
"v2026.3.23-2",
"v2026.3.23",
"v2026.3.23-beta.1",
"v2026.3.22",
"v2026.3.22-beta.1",
"v2026.3.13-1",
"v2026.3.13",
"v2026.3.12",
"v2026.3.11",
"v2026.3.11-beta.1",
"v2026.3.8",
"v2026.3.8-beta.1",
"v2026.3.7",
"v2026.3.7-beta.1",
"v2026.3.2-beta.1",
"v2026.3.2",
"v2026.3.1",
"v2026.2.26",
"v2026.2.26-beta.1",
"v2026.2.25",
"v2026.2.25-beta.1",
"v2026.2.24",
"v2026.2.24-beta.1",
"v2026.2.23",
"v2026.2.23-beta.1",
"v2026.2.22",
"v2026.2.22-beta.1",
"v2026.2.21",
"v2026.2.21-beta.1",
"v2026.2.19-beta.1",
"v2026.2.19",
"v2026.2.17",
"v2026.2.15-beta.1",
"v2026.2.14",
"v2026.2.13",
"v2026.2.12",
"v2026.2.9",
"v2026.2.6-3",
"v2026.2.6-2",
"v2026.2.6-1",
"v2026.2.6",
"v2026.2.3",
"v2026.2.2",
"v2026.2.1",
"v2026.1.30",
"v2026.1.29",
"v2026.1.24-1",
"v2026.1.24",
"v2026.1.23",
"v2026.1.22",
"v2026.1.21",
"v2026.1.20",
"v2026.1.16-2",
"v2026.1.15",
"v2026.1.14-1",
"v2026.1.13",
"v2026.1.12-2",
"v2026.1.12",
"v2026.1.11-3",
"v2026.1.11-2",
"v2026.1.11-1",
"v2026.1.11",
"v2026.1.10",
"v2026.1.9",
"v2026.1.8",
"v2026.1.5-3",
"v2026.1.5-2",
"v2026.1.5-1",
"v2026.1.5",
"v2.0.0-beta5",
"v2.0.0-beta4",
"v2.0.0-beta3",
"v2.0.0-beta2",
"v2.0.0-beta1",
"v1.3.0",
"v1.2.2",
"v1.2.1",
"v1.2.0",
"v1.1.0",
"v1.0.4",
"v0.1.3",
"v0.1.2",
"v0.1.1",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53859.json"
}
}
],
"modified": "2026-10-28T02:30:22.792958427Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53859.json",
"https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53859",
"https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency",
"https://github.com/openclaw/openclaw"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1023",
"CWE-918"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53859.json"
}
},
"related_cves": [
{
"value": "CVE-2026-53859",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 489142,
"published_at": "2026-06-16T18:05:06.511+00:00"
}