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CVE-2026-44459

Hono: Improper validation of NumericDate claims (exp, nbf, iat) in JWT verify()

Published: May 13, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-1284
NVD MITRE
3.8CVSSLOW
EPSS Score
0.2%
Top 88.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-1284

Affected Products

honohono
Library
OSS Libraries / web-framework
honohonojs
Library
OSS Libraries / web-framework
honooss-projectOSS Librariesaka hono js
honojsoss-projectOSS Librariesaka hono

Exploitability

Official Patch Available

References

https://github.com/honojs/hono/security/advisories/GHSA-hm8q-7f3q-5f36
github.com

Timeline

Published
May 13, 2026
Last Updated
May 13, 2026

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