CVE-2026-33129 (GCVE-0-2026-33129)

Vulnerability from cvelistv5 – Published: 2026-03-20 09:41 – Updated: 2026-03-20 19:33
VLAI
Title
h3 has an observable timing discrepancy in basic auth utils
Summary
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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-20 19:33 UTC
CWE
  • CWE-208 - Observable Timing Discrepancy
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
h3js h3 Affected: >= 2.0.1-beta.0, < 2.0.1-rc.9
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