CVE-2026-47675 json
Hono: Cookie helper does not sanitize sameSite and priority, allowing Set-Cookie injection
published 5mo ago modified 28d ago also EUVD-2026-32925 , GHSA-3hrh-pfw6-9m5x
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 12%
- public exploits
- 0
- none known
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the serialize() function in hono/cookie validates domain and path options against characters that corrupt Set-Cookie header syntax (;, \r, \n), but does not apply the same validation to sameSite and priority. An application that passes user-controlled input into either option may produce a Set-Cookie response header containing attacker-chosen additional attributes. This vulnerability is fixed in 4.12.21.
Patch / fix
- npm hono 4.12.21
- hono hono 4.12.21
Is CVE-2026-47675 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hono | <4.12.21 |
4.12.21 |
Affected products
- honojs hono
Classification
References
-
github.com
/honojs/hono/commit/905aedbc20661e0e2fa378783a7ec44a5c3df43d
web
-
github.com
/honojs/hono/security/advisories/GHSA-3hrh-pfw6-9m5x
web, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-47675
advisory
-
github.com
/honojs/hono
package
-
github.com
/honojs/hono/releases/tag/v4.12.21
web
Sources
- CVE List CVE-2026-47675
- GitHub Advisory GHSA-3hrh-pfw6-9m5x
- NVD CVE-2026-47675
- Maintainer advisory GHSA-3hrh-pfw6-9m5x
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of honojs/hono published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.