{"id":"CVE-2026-33129","state":"PUBLISHED","title":"h3 has an observable timing discrepancy in basic auth utils","description":"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.","publishedAt":"2026-03-20T09:41:21.933Z","updatedAt":"2026-03-20T19:33:49.871Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["h3js h3"],"affected":[{"vendor":"h3js","product":"h3","versions":[{"version":">= 2.0.1-beta.0, < 2.0.1-rc.9","status":"affected"}]}],"references":["https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh","https://github.com/h3js/h3/pull/1283","https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9"],"weaknesses":["CWE-208"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/33xxx/CVE-2026-33129.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33129","state":"PUBLISHED","datePublished":"2026-03-20T09:41:21.933Z","dateUpdated":"2026-03-20T19:33:49.871Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-17T20:35:49.927Z"},"containers":{"cna":{"title":"h3 has an observable timing discrepancy in basic auth utils","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"h3js","product":"h3","versions":[{"version":">= 2.0.1-beta.0, < 2.0.1-rc.9","status":"affected"}]}],"references":[{"url":"https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh","name":"https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/h3js/h3/pull/1283","name":"https://github.com/h3js/h3/pull/1283","tags":["x_refsource_MISC"]},{"url":"https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9","name":"https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-208","lang":"en","description":"CWE-208: Observable Timing Discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-20T09:41:21.933Z"},"source":{"advisory":"GHSA-26f5-8h2x-34xh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-20T19:33:14.795855Z","id":"CVE-2026-33129","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-20T19:33:49.871Z"}}]}}}