CVE-2026-44458: Hono is a Web application framework that provides support for any JavaScript runtime

Routine

MEDIUM 4.3UPGRADE

CVE-2026-44458 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 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

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	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-74, CWE-116
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: hono

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 16:16 UTCPublished CVE record published
2026-10-26 14:10 UTCUpdated Record last modified

hono hono UPGRADE

Affected: < 4.12.18

Fixed in: 4.12.18

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls hono

2. UPGRADE to 4.12.18

npm install hono@">=4.12.18"

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-2026-44458?

hono: upgrade to 4.12.18. Exact commands for each OS are on this page.

Is CVE-2026-44458 being exploited?

CVE-2026-44458 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-2026-44458 affect?

CVE-2026-44458 affects hono. Severity is medium (CVSS 4.3). 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 nam

How urgent is CVE-2026-44458?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2026-44456 MEDIUM 6.5 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44457 MEDIUM 5.3 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44455 MEDIUM 4.7 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-44459 LOW 3.8 UPGRADE Hono is a Web application framework that provides support for any JavaScript runtime
CVE-2026-56761 MEDIUM 4.3 UPGRADE hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attacker

References

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