{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"0.3.0"}],"component":"github.com/marten-seemann/webtransport-go","cve_ids":["CVE-2026-21434"],"ecosystem":"Go","epss":0.00465,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-g6x7-jq8p-6q9q","id":"tcs_01M5KGE0XJC8EVKN68Y5B4AGRG","modified_at":"2026-02-23T12:44:00.535972Z","published_at":"2026-02-19T17:28:55Z","references":["https://osv.dev/vulnerability/GO-2026-4485","https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g6x7-jq8p-6q9q","https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GO-2026-4485#Go/github.com/marten-seemann/webtransport-go","url":"https://osv.dev/vulnerability/GO-2026-4485"},{"source":"nvd","source_id":"CVE-2026-21434","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21434"}],"summary":"webtransport-go: Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule in github.com/quic-go/webtransport-go"}