How severe is CVE-2026-44458?

CVE-2026-44458 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-44458 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-2026-44458?

CVE-2026-44458 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44458?

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

Does CVE-2026-44458 have an EU (EUVD) identifier?

Yes. CVE-2026-44458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30037.

When was CVE-2026-44458 published?

CVE-2026-44458 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-44458

CVE-2026-44458 is a medium-severity vulnerability in Hono with a CVSS 3.x base score of 4.3. 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 4.3)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30037
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 4.12.18, the JSX renderer escapes style attribute object values for HTML but not for CSS. Untrusted input in a style object value or property name can therefore inject additional CSS declarations into the rendered style attribute. The impact is limited to CSS and does not allow JavaScript execution or HTML attribute breakout. This vulnerability is fixed in 4.12.18.

Frequently asked questions

What is CVE-2026-44458?: Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.18, the JSX renderer escapes style attribute object values for HTML but not for CSS. Untrusted input in a style object value or property name can therefore inject additional CSS declarations into the rendered style attribute. The impact is limited to CSS and does not allow JavaScript execution or HTML attribute breakout. This vulnerability is fixed in 4.12.18.
How severe is CVE-2026-44458?: CVE-2026-44458 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-44458 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-2026-44458?: CVE-2026-44458 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44458?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44458 have an EU (EUVD) identifier?: Yes. CVE-2026-44458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30037.
When was CVE-2026-44458 published?: CVE-2026-44458 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/honojs/hono/security/advisories/GHSA-qp7p-654g-cw7p

Affected products (1)

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

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