CVE-2026-33129 Details
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.
A timing side-channel vulnerability has been identified in the H3 framework, specifically in versions 2.0.1-beta.0 through 2.0.0-rc.8. The issue arises in the 'requireBasicAuth' function, where unsafe string comparison is used. This vulnerability allows attackers to deduce valid password characters one at a time by measuring response times, effectively bypassing password complexity requirements. The vulnerability is exploitable in local networks or cloud environments where the attacker shares network space with the target.
Users can upgrade to H3 version 2.0.1-rc.9 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/h3js/h3/pull/1283 | [email protected] | Issue Tracking |
| https://github.com/h3js/h3/releases/tag/v2.0.1-rc.9 | [email protected] | Patch |
| https://github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-208 | Observable Timing Discrepancy | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| h3 h3 | 2.0.0 2.0.1 rc1 2.0.1 rc2 2.0.1 rc3 2.0.1 rc4 2.0.1 rc5 2.0.1 rc6 2.0.1 rc7 2.0.1 rc8 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 20, 2026 | Initial Analysis | [email protected] |
| Mar 20, 2026 | New CVE Received | [email protected] |