{"action":"Upgrade github.com/quic-go/webtransport-go to 0.10.0 or later.","affected":[{"fixed":"0.10.0","introduced":"0.3.0"}],"component":"github.com/quic-go/webtransport-go","cve_ids":["CVE-2026-21434"],"ecosystem":"Go","epss":0.00465,"exploited":false,"fixed_versions":["0.10.0"],"ghsa_id":"GHSA-g6x7-jq8p-6q9q","id":"tcs_01M5KFAFS8A1JXP70ZXZFC0HX5","modified_at":"2026-09-10T03:50:35.012639183Z","published_at":"2026-02-12T15:28:52Z","references":["https://osv.dev/vulnerability/GHSA-g6x7-jq8p-6q9q","https://github.com/quic-go/webtransport-go/security/advisories/GHSA-g6x7-jq8p-6q9q","https://nvd.nist.gov/vuln/detail/CVE-2026-21434","https://github.com/quic-go/webtransport-go","https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-g6x7-jq8p-6q9q","url":"https://osv.dev/vulnerability/GHSA-g6x7-jq8p-6q9q"}],"summary":"webtransport-go: Memory Exhaustion Attack due to Missing Length Check in WT_CLOSE_SESSION Capsule"}