Timing Attack Affecting h3 package, versions <1.15.8>=2.0.0-beta.0 <2.0.1-rc.9
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
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Test your applications- Snyk IDSNYK-JS-H3-15692482
- published19 Mar 2026
- disclosed18 Mar 2026
- creditSimon Köck
Introduced: 18 Mar 2026
NewCVE-2026-33129 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade h3 to version 1.15.8, 2.0.1-rc.9 or higher.
Overview
h3 is a Minimal H(TTP) framework built for high performance and portability.
Affected versions of this package are vulnerable to Timing Attack via the requireBasicAuth function. An attacker can recover valid authentication credentials by measuring response times and deducing password characters one at a time through timing analysis of server responses.