{"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-2026-21438"],"ecosystem":"Go","epss":0.00406,"exploited":false,"fixed_versions":["0.10.0"],"ghsa_id":"GHSA-2f2x-8mwp-p2gc","id":"tcs_01M5KGE0498DGWB4YPBRXC1FZ5","modified_at":"2026-02-23T12:43:59.762993Z","published_at":"2026-02-17T18:09:06Z","references":["https://osv.dev/vulnerability/GO-2026-4483","https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc","https://nvd.nist.gov/vuln/detail/CVE-2026-21438","https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GO-2026-4483","url":"https://osv.dev/vulnerability/GO-2026-4483"},{"source":"nvd","source_id":"CVE-2026-21438","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21438"}],"summary":"webtransport-go: Memory Exhaustion Attack due to Missing Cleanup of Streams Map in github.com/quic-go/webtransport-go"}