{"id":"CVE-2026-33129","aliases":["GHSA-26f5-8h2x-34xh"],"url":"https://o3.security/vulnerability/CVE-2026-33129","summary":"h3 has an observable timing discrepancy in basic auth utils","details":"H3 is a minimal H(TTP) framework. Versions 2.0.1-beta.0 through 2.0.0-rc.8 contain a Timing Side-Channel vulnerability in the requireBasicAuth function due to the use of unsafe string comparison (!==). This allows an attacker to deduce the valid password character-by-character by measuring the server's response time, effectively bypassing password complexity protections. This issue is fixed in version 2.0.1-rc.9.","published":"2026-03-20T09:41:21.933Z","modified":"2026-08-12T03:51:44.233016201Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"h3","fixedVersion":"2.0.1-rc.9"}],"fix":{"url":"https://github.com/h3js/h3/pull/1283","label":"h3js/h3#1283"},"references":[{"type":"WEB","url":"https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33129.json"},{"type":"ADVISORY","url":"https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33129"},{"type":"FIX","url":"https://github.com/h3js/h3/pull/1283"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:44.233016201Z"}}