Improper Validation of Specified Quantity in Input in hono - CVE-2026-44459
Published: July 24, 2026
Vulnerability identifier: #VU139281
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44459
CWE-ID: CWE-1284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass time-based JWT claim validation.
The vulnerability exists due to improper validation of specified quantity in input in hono/utils/jwt verify() when processing JWT NumericDate claims. A remote privileged user can supply a crafted token with malformed exp, nbf, or iat values to bypass time-based JWT claim validation.
The issue only manifests when a malformed claim value reaches verify(), typically when the application issues such tokens itself or when the signing key is under the actor's control.
Affected software
hono
How to mitigate CVE-2026-44459
Install security update from vendor's website.
hono - update to 4.12.18