CVE-2026-39821 (GCVE-0-2026-39821)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-06-30 03:15
VLAI
Title
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
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".
Severity
9.6 (Critical)
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
21 references
Impacted products
81 products
Credits
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"value": "RHSA-2026:23262: Red Hat Hardened Images"
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{
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"value": "RHSA-2026:23264: Red Hat Hardened Images"
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"value": "RHSA-2026:33155: Red Hat OpenShift Service Mesh 2.6"
},
{
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"value": "RHSA-2026:33160: Red Hat OpenShift Service Mesh 3.0"
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{
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"value": "RHSA-2026:33163: Red Hat OpenShift Service Mesh 3.1"
},
{
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"value": "RHSA-2026:33173: Red Hat OpenShift Service Mesh 3.2"
},
{
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"value": "RHSA-2026:33183: Red Hat OpenShift Service Mesh 3.3"
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{
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"value": "RHSA-2026:30650: multicluster engine for Kubernetes 2.8"
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"value": "Reported to Red Hat."
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{
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"time": "2026-05-22T15:01:21.462Z",
"value": "Made public."
}
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"title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
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"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\"."
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{
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},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5026"
}
],
"title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"
}
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 9.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39821\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-23T03:55:58.522682Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"CWE-1289 Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T18:01:10.401Z\"}}], \"cna\": {\"title\": \"Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna\", \"credits\": [{\"lang\": \"en\", \"value\": \"KC1zs4 (https://github.com/KC1zs4)\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/idna\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.55.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/idna\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Profile.process\"}, {\"name\": \"Profile.ToASCII\"}, {\"name\": \"Profile.ToUnicode\"}, {\"name\": \"ToASCII\"}, {\"name\": \"ToUnicode\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/767220\"}, {\"url\": \"https://go.dev/issue/78760\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5026\"}], \"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\\\".\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-1289: Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-22T15:01:21.462Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-39821\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-27T13:13:15.606Z\", \"dateReserved\": \"2026-04-07T18:13:03.526Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-22T15:01:21.462Z\", \"assignerShortName\": \"Go\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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