UnratedFix available
golang: Fix of CVE-2026-39821
Type: advisorySources: OSV
- CVE-2026-39821: reject all-ASCII xn-- labels in the vendored golang.org/x/net/idna to prevent Punycode label spoofing
- Products
- go-toolset, golang, golang-bin, golang-docs, golang-misc, golang-src, golang-tests
- Affected versions
- Not specified
- Fixed versions
- 1.22.9-1.el9_2.tuxcare.els19
- CVEs
- CVE-2026-39821
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:39 UTC · Revision 1
Source evidence
- CVE-2026-39821: reject all-ASCII xn-- labels in the vendored golang.org/x/net/idna to prevent Punycode label spoofing
osv:CLSA-2026-1784533387
go-toolset
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang-bin
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang-docs
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang-misc
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang-src
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
golang-tests
Fixed versions: 1.22.9-1.el9_2.tuxcare.els19
Complete source record
{
"id": "83a8ff0d6ab0731385b9cc37238ec55fa4061ef579025b94d50136553db136bb",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784533387",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "golang: Fix of CVE-2026-39821",
"summary": "- CVE-2026-39821: reject all-ASCII xn-- labels in the vendored golang.org/x/net/idna to prevent Punycode label spoofing",
"evidence": "osv:CLSA-2026-1784533387",
"products": [
{
"name": {
"value": "go-toolset",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang-bin",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang-docs",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang-misc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang-src",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "golang-tests",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.22.9-1.el9_2.tuxcare.els19",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784533387",
"aliases": [
"CLSA-2026-1784533387"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "go-toolset",
"purl": "pkg:rpm/tuxcare/go-toolset?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang",
"purl": "pkg:rpm/tuxcare/golang?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang-bin",
"purl": "pkg:rpm/tuxcare/golang-bin?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang-docs",
"purl": "pkg:rpm/tuxcare/golang-docs?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang-misc",
"purl": "pkg:rpm/tuxcare/golang-misc?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang-src",
"purl": "pkg:rpm/tuxcare/golang-src?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.9-1.el9_2.tuxcare.els19"
}
]
}
],
"package": {
"name": "golang-tests",
"purl": "pkg:rpm/tuxcare/golang-tests?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1784533387.json"
}
}
],
"modified": "2026-10-26T09:30:12.047665785Z",
"provider": "osv",
"upstream": [
"CVE-2026-39821"
],
"references": [
"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1784533387.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
]
},
"related_cves": [
{
"value": "CVE-2026-39821",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 446904,
"published_at": "2026-07-20T07:43:30+00:00"
}