CVE-2026-33129

The record

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 packages

Related vulnerabilities

• GHSA-26f5-8h2x-34xh h3 has an observable timing discrepancy in basic auth utils Same vulnerability
• CVE-2026-33490 H3 is a minimal H(TTP) framework. Also affects h3
• GHSA-fp4x-ggrf-wmc6 H3 has an Open Redirect via Protocol-Relative Path in redirectBack() Referer Validation Also affects h3
• GHSA-q5pr-72pq-83v3 H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service Also affects h3
• GHSA-4hxc-9384-m385 h3: SSE Event Injection via Unsanitized Carriage Return (`\r`) in EventStream Data and… Also affects h3
• GHSA-2j6q-whv2-gh6w h3: Missing Path Segment Boundary Check in `mount()` Causes Middleware Execution on… Also affects h3
• GHSA-72gr-qfp7-vwhw h3: Double Decoding in `serveStatic` Bypasses `resolveDotSegments` Path Traversal… Also affects h3
• CVE-2026-33131 H3 is a minimal H(TTP) framework. Also affects h3