How severe is CVE-2026-24771?

CVE-2026-24771 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-2026-24771 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24771?

CVE-2026-24771 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24771?

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

Does CVE-2026-24771 have an EU (EUVD) identifier?

Yes. CVE-2026-24771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4752.

When was CVE-2026-24771 published?

CVE-2026-24771 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2026-24771

CVE-2026-24771 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4752
Weakness: CWE-79
Affected product: Hono
Published: 2026-01-27
Last modified: 2026-06-17

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, a Cross-Site Scripting (XSS) vulnerability exists in the `ErrorBoundary` component of the hono/jsx library. Under certain usage patterns, untrusted user-controlled strings may be rendered as raw HTML, allowing arbitrary script execution in the victim's browser. Version 4.11.7 patches the issue.

Frequently asked questions

What is CVE-2026-24771?: Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.11.7, a Cross-Site Scripting (XSS) vulnerability exists in the `ErrorBoundary` component of the hono/jsx library. Under certain usage patterns, untrusted user-controlled strings may be rendered as raw HTML, allowing arbitrary script execution in the victim's browser. Version 4.11.7 patches the issue.
How severe is CVE-2026-24771?: CVE-2026-24771 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-2026-24771 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24771?: CVE-2026-24771 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24771?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24771 have an EU (EUVD) identifier?: Yes. CVE-2026-24771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4752.
When was CVE-2026-24771 published?: CVE-2026-24771 was published on 2026-01-27 and last updated on 2026-06-17.

References

Affected products (1)

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

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