{"action":"Upgrade stdlib to 1.25.12 or later.","affected":[{"fixed":"1.25.12","introduced":"0"},{"fixed":"1.26.5","introduced":"1.26.0-0"},{"introduced":"1.27.0-0"}],"component":"stdlib","cve_ids":["CVE-2026-42505"],"ecosystem":"Go","epss":0.00382,"exploited":false,"fixed_versions":["1.25.12","1.26.5","1.27.0-rc.2"],"id":"tcs_01M5KGQA8FY8M3PNG325BYEQAC","modified_at":"2026-10-03T10:41:52.186009042Z","published_at":"2026-07-07T21:34:47Z","references":["https://osv.dev/vulnerability/GO-2026-5856","https://go.dev/cl/775960","https://go.dev/issue/79282","https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GO-2026-5856","url":"https://osv.dev/vulnerability/GO-2026-5856"},{"source":"nvd","source_id":"CVE-2026-42505","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42505"}],"summary":"Invoking Encrypted Client Hello privacy leak in crypto/tls"}