{"cve":"CVE-2026-33811","nvd":{"published":"2026-05-07T20:16:42.770","modified":"2026-10-26T00:10:00.150","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-415","CWE-1341"],"references":["https://go.dev/cl/767860","https://go.dev/issue/78803","https://groups.google.com/g/golang-announce/c/qcCIEXso47M","https://pkg.go.dev/vuln/GO-2026-4981","https://access.redhat.com/errata/RHSA-2026:22112"],"products":["golang:go"],"source":"nvd","synced_at":"2026-10-26T00:31:35.753532240+00:00"},"epss":{"cve":"CVE-2026-33811","score":0.00875,"percentile":0.58698,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GO-2026-4981","url":"https://osv.dev/vulnerability/GO-2026-4981","summary":"Crash when handling long CNAME response in net","modified":"2026-09-29T10:56:43.305065682Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.25.10",">=1.26.0-0 <1.26.3"],"fixed":["1.25.10","1.26.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}