Hono added timing comparison hardening in basicAuth and bearerAuth
## 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-56764US | — | — | ||
Hono before 4.11.10 contains a timing attack vulnerability in the basicAuth and bearerAuth middlewares due to non-constant-time string comparison in the timingSafeEqual function. A… | ||||
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