CVSS 3.1
4.8 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2026-39410
Medium (4.8) in hono hono. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in hono 4.12.12.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-11-01)
- CWE
- CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- hono:hono
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-r5rp-j6wh-rvv4 | npm | hono | <4.12.12 | 4.12.12 |