CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2026-33129
Medium (5.9) in h3 h3. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in h3 2.0.1-rc.9.
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
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-31)
- CWE
- CWE-208
- Published
- Modified
- Record from
- the NVD, synced
Affected
- h3:h3
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-26f5-8h2x-34xh | npm | h3 | >=2.0.0-beta.0 <2.0.1-rc.9 | 2.0.1-rc.9 |