CVE-2026-33129

PoC —

CVSS 3.1

5.9 medium

EPSS

<1%p25

Published

Mar 20, 2026 (Mar 20, 2026)

Modified

Jun 17, 2026

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.

Vendors: h3
Products: h3
Weakness: CWE-208
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.3%)

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