How severe is CVE-2026-44459?

CVE-2026-44459 has a CVSS 3.x base score of 3.8, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-44459 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44459?

CVE-2026-44459 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44459?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44459 have an EU (EUVD) identifier?

Yes. CVE-2026-44459 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30038.

When was CVE-2026-44459 published?

CVE-2026-44459 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44459

CVE-2026-44459 is a low-severity vulnerability in Hono with a CVSS 3.x base score of 3.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: Low (CVSS 3.x base score 3.8)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30038
Weakness: CWE-1284
Affected product: Hono
Published: 2026-05-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44459?: 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.
How severe is CVE-2026-44459?: CVE-2026-44459 has a CVSS 3.x base score of 3.8, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-44459 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44459?: CVE-2026-44459 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44459?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44459 have an EU (EUVD) identifier?: Yes. CVE-2026-44459 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30038.
When was CVE-2026-44459 published?: CVE-2026-44459 was published on 2026-05-13 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*

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