CVE-2026-56761: hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attacker

Routine

MEDIUM 4.3UPGRADE

CVE-2026-56761 is a medium-severity flaw (CVSS 4.3) affecting hono. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: hono

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 13:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

hono hono UPGRADE

Affected: < 4.12.14

Fixed in: 4.12.14

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls hono

2. UPGRADE to 4.12.14

npm install hono@">=4.12.14"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56761?

hono: upgrade to 4.12.14. Exact commands for each OS are on this page.

Is CVE-2026-56761 being exploited?

CVE-2026-56761 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56761 affect?

CVE-2026-56761 affects hono. Severity is medium (CVSS 4.3). 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 ch

How urgent is CVE-2026-56761?

Priority 20/100. No elevated risk signals yet.

Related CVEs

CVE-2026-59896 MEDIUM 6.5 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-59895 MEDIUM 6.1 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-59897 MEDIUM 4.8 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime

References

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