CVE-2026-39836
Full vulnerability record from the local CVENow database.
Description
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
Published
2026-05-07 20:16:43.593000
Last modified
2026-10-26 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-39836",
"sourceIdentifier": "[email protected]",
"published": "2026-05-07T20:16:43.593",
"lastModified": "2026-10-26T20:10:00.160",
"vulnStatus": "Analyzed",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0)."
},
{
"lang": "es",
"value": "Las funciones Dial y LookupPort entran en pánico en Windows cuando se les proporciona una entrada que contiene un NUL (0)."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Go standard library",
"product": "net",
"defaultStatus": "unaffected",
"collectionURL": "https://pkg.go.dev",
"packageName": "net",
"programRoutines": [
{
"name": "Resolver.lookupPort"
},
{
"name": "Resolver.lookupAddr"
},
{
"name": "Resolver.lookupTXT"
},
{
"name": "Resolver.lookupNS"
},
{
"name": "Resolver.lookupMX"
},
{
"name": "Resolver.lookupSRV"
},
{
"name": "Dial"
},
{
"name": "DialTimeout"
},
{
"name": "Dialer.Dial"
},
{
"name": "Dialer.DialContext"
},
{
"name": "Listen"
},
{
"name": "ListenConfig.Listen"
},
{
"name": "ListenConfig.ListenPacket"
},
{
"name": "ListenPacket"
},
{
"name": "LookupAddr"
},
{
"name": "LookupCNAME"
},
{
"name": "LookupHost"
},
{
"name": "LookupIP"
},
{
"name": "LookupMX"
},
{
"name": "LookupNS"
},
{
"name": "LookupPort"
},
{
"name": "LookupSRV"
},
{
"name": "LookupTXT"
},
{
"name": "ResolveIPAddr"
},
{
"name": "ResolveTCPAddr"
},
{
"name": "ResolveUDPAddr"
},
{
"name": "Resolver.LookupAddr"
},
{
"name": "Resolver.LookupCNAME"
},
{
"name": "Resolver.LookupHost"
},
{
"name": "Resolver.LookupIP"
},
{
"name": "Resolver.LookupIPAddr"
},
{
"name": "Resolver.LookupMX"
},
{
"name": "Resolver.LookupNS"
},
{
"name": "Resolver.LookupNetIP"
},
{
"name": "Resolver.LookupPort"
},
{
"name": "Resolver.LookupSRV"
},
{
"name": "Resolver.LookupTXT"
}
],
"versions": [
{
"version": "0",
"lessThan": "1.25.10",
"versionType": "semver",
"status": "affected"
},
{
"version": "1.26.0-0",
"lessThan": "1.26.3",
"versionType": "semver",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Primary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-08T16:36:25.079035Z",
"id": "CVE-2026-39836",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Primary",
"description": [
{
"lang": "en",
"value": "CWE-476"
}
]
}
],
"configurations": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.25.10",
"matchCriteriaId": "1C966EF3-C51C-4239-B5FC-C44A5202FEC8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
"versionStartIncluding": "1.26.0",
"versionEndExcluding": "1.26.3",
"matchCriteriaId": "522E4CD0-2B99-4363-9C78-0BAFD988A2D6"
}
]
}
]
}
],
"references": [
{
"url": "https://go.dev/cl/775320",
"source": "[email protected]",
"tags": [
"Patch"
]
},
{
"url": "https://go.dev/issue/79006",
"source": "[email protected]",
"tags": [
"Issue Tracking"
]
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
"source": "[email protected]",
"tags": [
"Issue Tracking",
"Mailing List"
]
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4971",
"source": "[email protected]",
"tags": [
"Vendor Advisory"
]
}
]
}