{"action":"Upgrade golang.org/x/net to 0.55.0 or later.","affected":[{"fixed":"0.55.0","introduced":"0"}],"component":"golang.org/x/net","cve_ids":["CVE-2026-39821"],"ecosystem":"Go","epss":0.01834,"exploited":false,"fixed_versions":["0.55.0"],"id":"tcs_01M5KGHDHCGQYMZRXGAM83AHR5","modified_at":"2026-10-16T10:42:05.164302476Z","published_at":"2026-05-22T02:46:43Z","references":["https://osv.dev/vulnerability/GO-2026-5026","https://go.dev/cl/767220","https://go.dev/issue/78760","https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8","https://groups.google.com/g/golang-announce/c/94pEornpRlI"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"GO-2026-5026#Go/golang.org/x/net","url":"https://osv.dev/vulnerability/GO-2026-5026"},{"source":"nvd","source_id":"CVE-2026-39821","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39821"}],"summary":"Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"}