CVE-2026-44457: Hono's Cache Middleware ignores Vary: Authorization / Vary: Cookie leading to cross-user cache leakage

May 9, 2026

Cache Middleware does not skip caching for responses that declare per-user variance via Vary: Authorization or Vary: Cookie. As a result, a response cached for one authenticated user may be served to subsequent requests from different users.

References

github.com/advisories/GHSA-p77w-8qqv-26rm
github.com/honojs/hono
github.com/honojs/hono/security/advisories/GHSA-p77w-8qqv-26rm
nvd.nist.gov/vuln/detail/CVE-2026-44457

Code Behaviors & Features

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