CVE-2026-33129 | h3js h3 up to 2.0.0-rc.8/2.0.1-rc.9 requireBasicAuth timing discrepancy

VDB-352054 · CVE-2026-33129 · GCVE-0-2026-33129 H3JS H3 UP TO 2.0.0-RC.8/2.0.1-RC.9 REQUIREBASICAUTH TIMING DISCREPANCY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.7 $0-$5k 2.69+ 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. 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/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.8 VulDB Meta Temp Score: 4.7 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.9 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Timing discrepancy CWE: CWE-208 / CWE-203 / CWE-200 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: h3 2.0.1-rc.9 Timelineinfo 03/17/2026 CVE reserved 03/20/2026 +3 days Advisory disclosed 03/20/2026 +0 days VulDB entry created 03/20/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33129 (🔒) GCVE (CVE): GCVE-0-2026-33129 GCVE (VulDB): GCVE-100-352054 Entryinfo Created: 03/20/2026 11:13 Changes: 03/20/2026 11:13 (63) Complete: 🔍 Cache ID: 99:DC5:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸