What’s Vulnerable › Vulnerabilities
CVE-2026-44459: Hono: Improper validation of NumericDate claims (exp, nbf, iat) in JWT verify()
- Severity: low (CVSS 3.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-13 · updated 2026-10-26
- Weakness: CWE-1284
Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, improper validation of the JWT NumericDate claims exp, nbf, and iat in hono/utils/jwt allows tokens with non-spec-compliant claim values to silently bypass time-based checks. This issue is not exploitable by an anonymous attacker; it only manifests when a malformed claim value reaches verify() — typically when the application itself issues such tokens, or when the signing key is otherwise under attacker control. This vulnerability is fixed in 4.12.18.
Affected products
- honojs hono: before 4.12.18 — fixed in 4.12.18
How to fix
Upgrade to a fixed version: honojs hono 4.12.18. Check the vendor advisory for mitigations.
References
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