h3js h3 up to 2.0.0-rc.8/2.0.1-rc.9 requireBasicAuth timing discrepancy

Summaryinfo

A vulnerability labeled as problematic has been found in h3js h3 up to 2.0.0-rc.8/2.0.1-rc.9. Affected is the function requireBasicAuth. Executing a manipulation can lead to timing discrepancy. The identification of this vulnerability is CVE-2026-33129. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in h3js h3 up to 2.0.0-rc.8/2.0.1-rc.9. This vulnerability affects the function requireBasicAuth. The manipulation with an unknown input leads to a timing discrepancy vulnerability. The CWE definition for the vulnerability is CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-33129 since 03/17/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.0.1-rc.9 eliminates this vulnerability.

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Productinfo

Vendor

• h3js

Name

• h3

Version

• 2.0.0-rc.0
• 2.0.0-rc.1
• 2.0.0-rc.2
• 2.0.0-rc.3
• 2.0.0-rc.4
• 2.0.0-rc.5
• 2.0.0-rc.6
• 2.0.0-rc.7
• 2.0.0-rc.8
• 2.0.1-rc.0
• 2.0.1-rc.1
• 2.0.1-rc.2
• 2.0.1-rc.3
• 2.0.1-rc.4
• 2.0.1-rc.5
• 2.0.1-rc.6
• 2.0.1-rc.7
• 2.0.1-rc.8
• 2.0.1-rc.9

Website

• Product: https://github.com/h3js/h3/

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