{"api_version":"1","generated_at":"2026-07-23T15:30:25+00:00","cve":"CVE-2026-39836","urls":{"html":"https://cve.report/CVE-2026-39836","api":"https://cve.report/api/cve/CVE-2026-39836.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-39836","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-39836"},"summary":{"title":"Panic in Dial and LookupPort when handling NUL byte on Windows in net","description":"The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).","state":"PUBLISHED","assigner":"Go","published_at":"2026-05-07 20:16:43","updated_at":"2026-05-08 22:16:29"},"problem_types":["CWE-248: Uncaught Exception"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"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"}}],"references":[{"url":"https://pkg.go.dev/vuln/GO-2026-4971","name":"https://pkg.go.dev/vuln/GO-2026-4971","refsource":"security@golang.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://go.dev/cl/775320","name":"https://go.dev/cl/775320","refsource":"security@golang.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://go.dev/issue/79006","name":"https://go.dev/issue/79006","refsource":"security@golang.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M","name":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M","refsource":"security@golang.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39836","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39836","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Go standard library","product":"net","version":"affected 1.25.10 semver","platforms":[]},{"source":"CNA","vendor":"Go standard library","product":"net","version":"affected 1.26.0-0 1.26.3 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"39836","cve":"CVE-2026-39836","epss":"0.000180000","percentile":"0.047170000","score_date":"2026-05-12","updated_at":"2026-05-13 00:11:54"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-39836","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-05-08T16:36:25.079035Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-05-08T21:30:15.127Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"collectionURL":"https://pkg.go.dev","defaultStatus":"unaffected","packageName":"net","product":"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"}],"vendor":"Go standard library","versions":[{"lessThan":"1.25.10","status":"affected","version":"0","versionType":"semver"},{"lessThan":"1.26.3","status":"affected","version":"1.26.0-0","versionType":"semver"}]}],"descriptions":[{"lang":"en","value":"The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0)."}],"problemTypes":[{"descriptions":[{"description":"CWE-248: Uncaught Exception","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-05-07T19:41:18.300Z","orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","shortName":"Go"},"references":[{"url":"https://go.dev/issue/79006"},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"},{"url":"https://go.dev/cl/775320"},{"url":"https://pkg.go.dev/vuln/GO-2026-4971"}],"title":"Panic in Dial and LookupPort when handling NUL byte on Windows in net"}},"cveMetadata":{"assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","assignerShortName":"Go","cveId":"CVE-2026-39836","datePublished":"2026-05-07T19:41:18.300Z","dateReserved":"2026-04-07T18:13:03.529Z","dateUpdated":"2026-05-08T21:30:15.127Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-07 20:16:43","lastModifiedDate":"2026-05-08 22:16:29","problem_types":["CWE-248: Uncaught Exception"],"metrics":{"cvssMetricV31":[{"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"39836","Ordinal":"1","Title":"Panic in Dial and LookupPort when handling NUL byte on Windows i","CVE":"CVE-2026-39836","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"39836","Ordinal":"1","NoteData":"The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).","Type":"Description","Title":"Panic in Dial and LookupPort when handling NUL byte on Windows i"}]}}}