CVE catalog
CVE-2026-59895
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as alread
- Severity
- Medium · CVSS 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.0.0 before 4.12.27, cx() in hono/css composes class names from plain strings but marks the result as already escaped without HTML-escaping the input, allowing untrusted className values used in a JSX class attribute during server-side rendering to break out of the attribute and inject arbitrary markup. This issue is fixed in version 4.12.27.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | hono | Not reported | 4.12.27 | fixed |
| Npm | hono | Not reported | 4.12.27 | fixed |
| Npm | hono | Not reported | 4.12.27 | fixed |
| Cpe | hono | Not reported | 4.12.27 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | hono | cpe | Not reported | 4.12.27 | Not reported | Not reported | Not reported |
| Npm | hono | npm | Not reported | 4.12.27 | Not reported | GHSA-W62V-XXXG-MG59 | Not reported |
| Npm | hono | npm | Not reported | 4.12.27 | Not reported | Not reported | Not reported |
| Cpe | hono | cpe | Not reported | 4.12.27 | Not reported | NVD-CVE-2026-59895 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/honojs/hono/commit/cd3f6f7194f0e5c9d4b26ae0cf232018d0f388fc]
- [https://github.com/honojs/hono/releases/tag/v4.12.27]
- [https://github.com/honojs/hono/security/advisories/GHSA-w62v-xxxg-mg59]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-59895]
- [https://osv.dev/vulnerability/GHSA-w62v-xxxg-mg59]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59895.json]
[FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]