{"action":"Upgrade h3 to 2.0.1-rc.18 or later.","affected":[{"fixed":"2.0.1-rc.18","introduced":"2.0.0-beta.4"}],"component":"h3","cve_ids":["CVE-2026-86250"],"ecosystem":"npm","epss":0.00488,"exploited":false,"fixed_versions":["2.0.1-rc.18"],"ghsa_id":"GHSA-q5pr-72pq-83v3","id":"tcs_01M5KG59ZHC2ZC377NTG3HR0Q4","modified_at":"2026-10-01T00:00:05.804891230Z","published_at":"2026-03-23T21:44:55Z","references":["https://osv.dev/vulnerability/GHSA-q5pr-72pq-83v3","https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3","https://nvd.nist.gov/vuln/detail/CVE-2026-86250","https://github.com/h3js/h3/commit/399257cb406fbeda313d88c1e288a15124fc82af","https://github.com/h3js/h3","https://github.com/h3js/h3/releases/tag/v2.0.1-rc.18","https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-q5pr-72pq-83v3","url":"https://osv.dev/vulnerability/GHSA-q5pr-72pq-83v3"}],"summary":"H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service"}