CVE-2026-33129

Published March 20th, 2026

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CVSS v3

5.9

MEDIUM

CVSS v2

N/A

Affected

PROJECT

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.

h3js/h3

⚡️ Minimal H(TTP) framework built for high performance and portability

GitHub

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