CVE-2026-33129

5.9 MEDIUM
Published: March 20, 2026 Modified: March 20, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/h3js/h3/pull/1283
Source: security-advisories@github.com
Issue Tracking
https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9
Source: security-advisories@github.com
Patch
https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh
Source: security-advisories@github.com
Exploit Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.9 / 10.0
EPSS (Exploit Probability)
0.0%
12th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

h3