GitHub Advisoryadvisory · npm
GHSA-gq3j-xvxp-8hrf Hono added timing comparison hardening in basicAuth and bearerAuth
LOW
Official page ↗
- Ecosystem
- npm
- Packages
- hono
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- CWE-208
- Reviewed
- 2026-02-19
Affected packages
• npm hono: < 4.11.10 → fixed in 4.11.10
Description
Summary
The `basicAuth` and `bearerAuth` middlewares previously used a comparison that was not fully timing-safe.
The `timingSafeEqual` function used normal string equality (`===`) when comparing hash values. This comparison may stop early if values differ, which can theoretically cause small timing differences.
The implementation has been updated to use a safer comparison method.
Details
The issue was caused by the use of normal string equality (`===`) when comparing hash values inside the `timingSafeEqual` function.
In JavaScript, string comparison may stop as soon as a difference is found. This means the comparison time can slightly vary depending on how many characters match.
Under very specific and controlled conditions, this behavior could theoretically allow timing-based analysis.
The implementation has been updated to:
• Avoid early termination during comparison
• Use a constant-time-style comparison method
Impact
This issue is unlikely to be exploited in normal environments.
It may only be relevant in highly controlled situations where precise timing measurements are possible.
This change is considered a security hardening improvement. Users are encouraged to upgrade to the latest version.
Related
Weakness · CWE (1)
- CWE-208 Observable Timing Discrepancy weakness