Medium
Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
Type: advisorySources: OSV
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-61727
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 14:09 UTC · Revision 1
Source evidence
Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509
core-osv · Original sourcePublished 3 Dec 2025, 19:37 UTC
An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.
osv:CVE-2025-61727
Complete source record
{
"id": "abcaf7daed80b25447be18f1e7c424b87d85e08b6c9a811efa721185c3325eaf",
"url": "https://osv.dev/vulnerability/CVE-2025-61727",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Improper application of excluded DNS name constraints when verifying wildcard names in crypto/x509",
"summary": "An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.",
"evidence": "osv:CVE-2025-61727",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-61727",
"aliases": [
"BIT-golang-2025-61727",
"CVE-2025-61727",
"GO-2025-4175"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
}
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"modified": "2026-10-28T02:30:36.060114070Z",
"provider": "osv",
"references": [
"https://go.dev/cl/723900",
"https://go.dev/issue/76442",
"https://groups.google.com/g/golang-announce/c/8FJoBkPddm4",
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"source_id": "core-osv",
"document_id": 503493,
"published_at": "2025-12-03T19:37:15.054+00:00"
}