{"id":"GHSA-fg72-q65g-wm5w","summary":"Duplicate Advisory: H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service","details":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-q5pr-72pq-83v3. This link is maintained to preserve external references.\n\n## Original Description\nh3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n²) cleanup loop that hangs the server process.","modified":"2026-10-01T00:00:04.681292459Z","published":"2026-09-06T12:30:23Z","withdrawn":"2026-09-30T23:46:36Z","database_specific":{"nvd_published_at":"2026-09-06T12:17:15Z","cwe_ids":["CWE-400"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-09-30T23:46:36Z"},"references":[{"type":"WEB","url":"https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86250"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie"}],"affected":[{"package":{"name":"h3","ecosystem":"npm","purl":"pkg:npm/h3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0-beta.4"}]}],"database_specific":{"last_known_affected_version_range":"\u003c 2.0.1-rc.18","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-fg72-q65g-wm5w/GHSA-fg72-q65g-wm5w.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}