What’s Vulnerable › Vulnerabilities
CVE-2026-44457: Hono: Cache Middleware ignores Vary: Authorization / Vary: Cookie leading to cross-user cache leakage
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-13 · updated 2026-10-26
- Weakness: CWE-524
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, 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. This vulnerability is fixed in 4.12.18.
Affected products
- honojs hono: before 4.12.18 — fixed in 4.12.18
How to fix
Upgrade to a fixed version: honojs hono 4.12.18. Check the vendor advisory for mitigations.
References
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