How severe is CVE-2026-44455?

CVE-2026-44455 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-44455 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44455?

CVE-2026-44455 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44455?

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

Does CVE-2026-44455 have an EU (EUVD) identifier?

Yes. CVE-2026-44455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30034.

When was CVE-2026-44455 published?

CVE-2026-44455 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44455

CVE-2026-44455 is a medium-severity vulnerability in Hono with a CVSS 3.x base score of 4.7. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30034
Weakness: CWE-74
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 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.

Frequently asked questions

What is CVE-2026-44455?: Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.
How severe is CVE-2026-44455?: CVE-2026-44455 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-44455 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44455?: CVE-2026-44455 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44455?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44455 have an EU (EUVD) identifier?: Yes. CVE-2026-44455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30034.
When was CVE-2026-44455 published?: CVE-2026-44455 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/honojs/hono/security/advisories/GHSA-69xw-7hcm-h432

Affected products (1)

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

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