How severe is CVE-2026-56761?

CVE-2026-56761 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-2026-56761 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-56761?

CVE-2026-56761 affects Hono. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-56761?

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

Does CVE-2026-56761 have an EU (EUVD) identifier?

Yes. CVE-2026-56761 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38757.

When was CVE-2026-56761 published?

CVE-2026-56761 was published on 2026-06-24 and last updated on 2026-06-26.

CVE-2026-56761

CVE-2026-56761 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38757
Weakness: CWE-79
Affected product: Hono
Published: 2026-06-24
Last modified: 2026-06-26

Description

hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attackers to inject unintended html by using malformed attribute names. Attackers can craft specially crafted attribute keys containing characters like quotes or angle brackets to break html tag boundaries and inject arbitrary attributes or elements.

Frequently asked questions

What is CVE-2026-56761?: hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attackers to inject unintended html by using malformed attribute names. Attackers can craft specially crafted attribute keys containing characters like quotes or angle brackets to break html tag boundaries and inject arbitrary attributes or elements.
How severe is CVE-2026-56761?: CVE-2026-56761 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-2026-56761 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-56761?: CVE-2026-56761 affects Hono. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-56761?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56761 have an EU (EUVD) identifier?: Yes. CVE-2026-56761 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38757.
When was CVE-2026-56761 published?: CVE-2026-56761 was published on 2026-06-24 and last updated on 2026-06-26.

References

Affected products (1)

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

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