CVE-2026-33129

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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-20 | Assigner GitHub_M

Problem types

CWE-208: Observable Timing Discrepancy

Product status

References

github.com/h3js/h3/security/advisories/GHSA-26f5-8h2x-34xh

github.com/h3js/h3/pull/1283

github.com/h3js/h3/releases/tag/v2.0.1-rc.9

cve.org (CVE-2026-33129)

nvd.nist.gov (CVE-2026-33129)

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