CVE-2026-39410Hono is a Web application framework that provides support for any JavaScript runtime.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 4.8 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-20
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
hono hono hono:hono | through 4.12.11 | NVD |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.