Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hono | Hono | <= 4.12.11 |
Related Weaknesses (CWE)
References
- https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0Third Party Advisory
- https://github.com/honojs/hono/releases/tag/v4.12.12Release Notes
- https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4Vendor Advisory
FAQ
What is CVE-2026-39410?
CVE-2026-39410 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 protectio...
How severe is CVE-2026-39410?
CVE-2026-39410 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39410?
Check the references section above for vendor advisories and patch information. Affected products include: Hono Hono.