{"action":"Upgrade stdlib to 1.25.10 or later.","affected":[{"fixed":"1.25.10","introduced":"0"},{"fixed":"1.26.3","introduced":"1.26.0-0"}],"component":"stdlib","cve_ids":["CVE-2026-39820"],"ecosystem":"Go","epss":0.00784,"exploited":false,"fixed_versions":["1.25.10","1.26.3"],"id":"tcs_01M5KGH6N3CP4Q55X6Y2PM8PNZ","modified_at":"2026-10-07T10:41:45.865352723Z","published_at":"2026-05-07T19:21:40Z","references":["https://osv.dev/vulnerability/GO-2026-4986","https://go.dev/issue/78566","https://go.dev/cl/759940","https://groups.google.com/g/golang-announce/c/qcCIEXso47M"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2026-4986","url":"https://osv.dev/vulnerability/GO-2026-4986"},{"source":"nvd","source_id":"CVE-2026-39820","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39820"}],"summary":"Quadratic string concatentation in consumeComment in net/mail"}