{"id":"GO-2026-4981","aliases":["BIT-golang-2026-33811","CVE-2026-33811"],"title":"Crash when handling long CNAME response in net","titleSource":"OSV","descriptionSource":"OSV","description":"When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.","severity":"unknown","score":null,"published":"2026-05-07T19:21:40.000Z","modified":"2026-11-14T13:12:13.381Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-4981","url":"https://osv.dev/vulnerability/GO-2026-4981"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.25.10"},{"introduced":"1.26.0-0"},{"fixed":"1.26.3"}],"type":"SEMVER"}],"versions":[],"fixed":["1.25.10","1.26.3"]}],"sourceAffected":[],"references":["https://go.dev/issue/78803","https://go.dev/cl/767860","https://groups.google.com/g/golang-announce/c/qcCIEXso47M"],"sources":[{"name":"OSV","id":"GO-2026-4981","modified":"2026-11-14T13:12:13.381861751Z","url":"https://osv.dev/vulnerability/GO-2026-4981"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:04:37.027Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:50:31.401Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T00:25:35.857Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T00:15:34.489Z","attemptedAt":"2026-11-14T00:15:34.489Z"},{"source":"EUVD","status":"refresh-failed","attemptedAt":"2026-11-14T00:15:35.546Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T00:15:33.436Z","attemptedAt":"2026-11-14T00:15:33.436Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-33811","url":"https://www.first.org/epss/","probability":0.00875,"percentile":0.59496,"date":"2026-11-13","checkedAt":"2026-11-14T00:15:33.436Z"},{"source":"GitHub Advisory Database","id":"GHSA-497x-jcxf-m478","url":"https://github.com/advisories/GHSA-497x-jcxf-m478","modified":"2026-09-15T12:31:37Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T00:15:34.489Z"}],"aiSummary":null}