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
- external-dns, istio-pilot-discovery, nfs-subdir-external-provisioner, ollama-fips, stakater-reloader, temporal-server-fips
- Affected versions
- Not specified
- Fixed versions
- 0.20.0-r3, 0.40.3-r1, 1.1.0-r5, 1.2.1-r10, 1.29.8-r1, 1.30.1-r1, 1.31.4-r1, 1.4.17-r1, 4.0.18-r3
- CVEs
- CVE-2026-39821
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 13:00 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 15 Oct 2026, 00:41 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-RT11229
ollama-fips
Fixed versions: 0.40.3-r1
ollama-fips
Fixed versions: 0.40.3-r1
temporal-server-fips
Fixed versions: 1.31.4-r1
stakater-reloader
Fixed versions: 1.2.1-r10
stakater-reloader
Fixed versions: 1.4.17-r1
istio-pilot-discovery
Fixed versions: 1.29.8-r1
istio-pilot-discovery
Fixed versions: 1.30.1-r1
stakater-reloader
Fixed versions: 1.1.0-r5
nfs-subdir-external-provisioner
Fixed versions: 4.0.18-r3
external-dns
Fixed versions: 0.20.0-r3
Complete source record
{
"id": "dfeb17e84d4ea135e5c60351b05fc963eff7c7d0c3bdeae57fb07adeff230e0f",
"url": "https://osv.dev/vulnerability/CLEANSTART-2026-RT11229",
"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-RT11229",
"products": [
{
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"evidence": "/affected/0/package/name"
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{
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{
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},
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{
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{
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"affected_versions": []
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{
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"evidence": "/affected/5/package/name"
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},
{
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{
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{
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"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nfs-subdir-external-provisioner",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.0.18-r3",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "external-dns",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.20.0-r3",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
}
],
"severity": "critical",
"structured": {
"id": "CLEANSTART-2026-RT11229",
"aliases": [
"CLEANSTART-2026-RT11229"
],
"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": "0.40.3-r1"
}
]
}
],
"package": {
"name": "ollama-fips",
"purl": "pkg:apk/cleanstart/ollama-fips?arch=x86_64",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
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"events": [
{
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{
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}
],
"package": {
"name": "ollama-fips",
"purl": "pkg:apk/cleanstart/ollama-fips?arch=aarch64",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.31.4-r1"
}
]
}
],
"package": {
"name": "temporal-server-fips",
"purl": "pkg:apk/cleanstart/temporal-server-fips",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.2.1-r10"
}
]
}
],
"package": {
"name": "stakater-reloader",
"purl": "pkg:apk/cleanstart/stakater-reloader",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.4.17-r1"
}
]
}
],
"package": {
"name": "stakater-reloader",
"purl": "pkg:apk/cleanstart/stakater-reloader",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.29.8-r1"
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]
}
],
"package": {
"name": "istio-pilot-discovery",
"purl": "pkg:apk/cleanstart/istio-pilot-discovery",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
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{
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}
]
}
],
"package": {
"name": "istio-pilot-discovery",
"purl": "pkg:apk/cleanstart/istio-pilot-discovery",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "1.1.0-r5"
}
]
}
],
"package": {
"name": "stakater-reloader",
"purl": "pkg:apk/cleanstart/stakater-reloader",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.0.18-r3"
}
]
}
],
"package": {
"name": "nfs-subdir-external-provisioner",
"purl": "pkg:apk/cleanstart/nfs-subdir-external-provisioner",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.20.0-r3"
}
]
}
],
"package": {
"name": "external-dns",
"purl": "pkg:apk/cleanstart/external-dns",
"ecosystem": "CleanStart"
},
"database_specific": {
"source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RT11229.json"
}
}
],
"modified": "2026-10-15T01:00:29.773429173Z",
"provider": "osv",
"upstream": [
"CVE-2026-39821"
],
"references": [
"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-RT11229.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": 318389,
"published_at": "2026-10-15T00:41:45.259381+00:00"
}