{"id":"CVE-2026-39836","sourceIdentifier":"security@golang.org","published":"2026-05-07T20:16:43.593","lastModified":"2026-06-17T10:42:40.340","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0)."}],"affected":[{"source":"security@golang.org","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":"nvd@nist.gov","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":"nvd@nist.gov","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":"security@golang.org","tags":["Patch"]},{"url":"https://go.dev/issue/79006","source":"security@golang.org","tags":["Issue Tracking"]},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M","source":"security@golang.org","tags":["Issue Tracking","Mailing List"]},{"url":"https://pkg.go.dev/vuln/GO-2026-4971","source":"security@golang.org","tags":["Vendor Advisory"]}]}