{"action":"Upgrade github.com/quic-go/webtransport-go to 0.10.0 or later.","affected":[{"fixed":"0.10.0","introduced":"0"}],"component":"github.com/quic-go/webtransport-go","cve_ids":["CVE-2026-21435"],"ecosystem":"Go","epss":0.00465,"exploited":false,"fixed_versions":["0.10.0"],"ghsa_id":"GHSA-px4r-g4p3-hhqv","id":"tcs_01M5KGE1SJ16SMWH400Y409PHZ","modified_at":"2026-02-23T12:43:59.680487Z","published_at":"2026-02-17T18:09:06Z","references":["https://osv.dev/vulnerability/GO-2026-4488","https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv","https://nvd.nist.gov/vuln/detail/CVE-2026-21435","https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2026-4488","url":"https://osv.dev/vulnerability/GO-2026-4488"},{"source":"nvd","source_id":"CVE-2026-21435","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21435"}],"summary":"webtransport-go: CloseWithError can block indefinitely in github.com/quic-go/webtransport-go"}