Use of cache containing sensitive information in hono - CVE-2026-44457
Published: July 24, 2026
Vulnerability identifier: #VU139284
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44457
CWE-ID: CWE-524
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to use of cache containing sensitive information in Cache Middleware when handling responses that declare per-user variance via Vary: Authorization or Vary: Cookie. A remote attacker can send a request to an affected user-specific endpoint to disclose sensitive information.
The issue occurs when applications rely on these Vary headers to scope user-specific responses without also marking the response as private.
Affected software
hono
How to mitigate CVE-2026-44457
Install security update from vendor's website.
hono - update to 4.12.18