How severe is CVE-2026-47673?

CVE-2026-47673 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-47673 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47673?

CVE-2026-47673 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47673?

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

Does CVE-2026-47673 have an EU (EUVD) identifier?

Yes. CVE-2026-47673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32927.

When was CVE-2026-47673 published?

CVE-2026-47673 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-47673

CVE-2026-47673 is a medium-severity vulnerability in Hono with a CVSS 3.x base score of 4.8. 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-285.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32927
Weakness: CWE-285
Affected product: Hono
Published: 2026-05-28
Last modified: 2026-06-17

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify that the Authorization header value uses theBearer scheme. Any two-part header value — regardless of the scheme name in the first position — proceeds to JWT verification. A request presenting a valid JWT under a non-Bearer scheme identifier (such as Basic or Token) is authenticated identically to a correctly formed Bearer request. This vulnerability is fixed in 4.12.21.

Frequently asked questions

What is CVE-2026-47673?: Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, the jwt and jwk middlewares do not verify that the Authorization header value uses theBearer scheme. Any two-part header value — regardless of the scheme name in the first position — proceeds to JWT verification. A request presenting a valid JWT under a non-Bearer scheme identifier (such as Basic or Token) is authenticated identically to a correctly formed Bearer request. This vulnerability is fixed in 4.12.21.
How severe is CVE-2026-47673?: CVE-2026-47673 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-47673 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47673?: CVE-2026-47673 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47673?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-47673 have an EU (EUVD) identifier?: Yes. CVE-2026-47673 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32927.
When was CVE-2026-47673 published?: CVE-2026-47673 was published on 2026-05-28 and last updated on 2026-06-17.

References

https://github.com/honojs/hono/security/advisories/GHSA-f577-qrjj-4474

Affected products (1)

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

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