FKIE_CVE-2026-39821
Vulnerability from fkie_nvd - Published: 2026-05-22 16:16 - Updated: 2026-07-02 12:17
Severity ?
9.6 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
8.2 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
8.2 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Summary
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".
References
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/net/idna",
"product": "golang.org/x/net/idna",
"programRoutines": [
{
"name": "Profile.process"
},
{
"name": "Profile.ToASCII"
},
{
"name": "Profile.ToUnicode"
},
{
"name": "ToASCII"
},
{
"name": "ToUnicode"
}
],
"vendor": "golang.org/x/net",
"versions": [
{
"lessThan": "0.55.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"source": "security@golang.org"
},
{
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],
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},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:enterprise_linux:9::appstream"
],
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"product": "Red Hat Enterprise Linux AppStream (v. 9)",
"vendor": "Red Hat"
},
{
"cpes": [
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{
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{
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},
{
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},
{
"cpes": [
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},
{
"cpes": [
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},
{
"cpes": [
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"product": "Red Hat Hardened Images",
"vendor": "Red Hat"
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{
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{
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{
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{
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{
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{
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{
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},
{
"cpes": [
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"defaultStatus": "affected",
"product": "Fence Agents Remediation Operator",
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},
{
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"product": "File Integrity Operator",
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},
{
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{
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},
{
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],
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"product": "Migration Toolkit for Applications 8",
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},
{
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{
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{
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{
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{
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{
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},
{
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},
{
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},
{
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_pipelines:1"
],
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"product": "OpenShift Pipelines",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:serverless:1"
],
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"product": "OpenShift Serverless",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_power_monitoring"
],
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"product": "Power monitoring for Red Hat OpenShift",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:red_hat_3scale_amp:2"
],
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"product": "Red Hat 3scale API Management Platform 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:acm:2"
],
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"product": "Red Hat Advanced Cluster Management for Kubernetes 2",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Red Hat Ansible Automation Platform 2",
"vendor": "Red Hat"
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{
"cpes": [
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{
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{
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{
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{
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"vendor": "Red Hat"
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{
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{
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{
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{
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{
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{
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{
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],
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"product": "Red Hat Lightspeed for Runtimes Operator",
"vendor": "Red Hat"
},
{
"cpes": [
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"vendor": "Red Hat"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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],
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},
{
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{
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],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:golang:net:*:*:*:*:*:go:*:*",
"matchCriteriaId": "38C86E7B-A1CA-4670-B113-FC9585261F6F",
"versionEndExcluding": "0.55.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\"."
}
],
"id": "CVE-2026-39821",
"lastModified": "2026-07-02T12:17:12.240",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.6,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.1,
"impactScore": 5.8,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.8,
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
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"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-23T03:55:58.522682Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-05-22T16:16:20.410",
"references": [
{
"source": "security@golang.org",
"tags": [
"Issue Tracking"
],
"url": "https://go.dev/cl/767220"
},
{
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],
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},
{
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],
"url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
},
{
"source": "security@golang.org",
"tags": [
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],
"url": "https://pkg.go.dev/vuln/GO-2026-5026"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:33160"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:33163"
},
{
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"url": "https://access.redhat.com/errata/RHSA-2026:33173"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:33183"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:33524"
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:33531"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:34342"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:34357"
},
{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:34359"
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{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/errata/RHSA-2026:34364"
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{
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"url": "https://access.redhat.com/security/cve/CVE-2026-39821"
},
{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480756"
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{
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"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json"
}
],
"sourceIdentifier": "security@golang.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-1289"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-1289"
}
],
"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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