CVE-2026-39410
MEDIUM
NVD
CVSS Score
4.8
Severity
MEDIUM
Published
Apr 08, 2026
Vendor
unknown
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12.