CriticalFix available
ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label
Type: advisorySources: OSV
CVE-2026-39821 affects multiple packages. The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. See references for individual vulnerability details.
- Products
- gatekeeper-fips, loki
- Affected versions
- Not specified
- Fixed versions
- 3.22.0-r0, 3.6.15-r0
- CVEs
- CVE-2026-39821
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:30 UTC · Revision 1
Source evidence
ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label
core-osv · Original sourcePublished 20 Oct 2026, 00:39 UTC
CVE-2026-39821 affects multiple packages. The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. See references for individual vulnerability details.
osv:CLEANSTART-2026-TJ78726
gatekeeper-fips
Fixed versions: 3.22.0-r0
loki
Fixed versions: 3.6.15-r0
loki
Fixed versions: 3.6.15-r0
loki
Fixed versions: 3.6.15-r0
loki
Fixed versions: 3.6.15-r0
Complete source record
{
"id": "057bac572a56c89ecb91370df78e316caa1829a56456080eda65bc0ab65c4c58",
"url": "https://osv.dev/vulnerability/CLEANSTART-2026-TJ78726",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label",
"summary": "CVE-2026-39821 affects multiple packages. The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. See references for individual vulnerability details.",
"evidence": "osv:CLEANSTART-2026-TJ78726",
"products": [
{
"name": {
"value": "gatekeeper-fips",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.22.0-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "loki",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.15-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "loki",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.15-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "loki",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.15-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "loki",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.15-r0",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "critical",
"structured": {
"id": "CLEANSTART-2026-TJ78726",
"aliases": [
"CLEANSTART-2026-TJ78726"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.22.0-r0"
}
]
}
],
"package": {
"name": "gatekeeper-fips",
"purl": "pkg:apk/cleanstart/gatekeeper-fips",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-TJ78726.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.15-r0"
}
]
}
],
"package": {
"name": "loki",
"purl": "pkg:apk/cleanstart/loki?arch=x86_64",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-TJ78726.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.15-r0"
}
]
}
],
"package": {
"name": "loki",
"purl": "pkg:apk/cleanstart/loki?arch=aarch64",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-TJ78726.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.15-r0"
}
]
}
],
"package": {
"name": "loki",
"purl": "pkg:apk/cleanstart/loki?arch=ppc64le",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-TJ78726.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.15-r0"
}
]
}
],
"package": {
"name": "loki",
"purl": "pkg:apk/cleanstart/loki?arch=loongarch64",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-TJ78726.json"
}
}
],
"modified": "2026-10-21T01:15:28.206587843Z",
"provider": "osv",
"upstream": [
"CVE-2026-39821"
],
"references": [
"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-TJ78726.json",
"https://osv.dev/vulnerability/CVE-2026-39821",
"https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2026-39821",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 390991,
"published_at": "2026-10-20T00:39:04.135887+00:00"
}