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VulnerabilityPublished Updated

CVE-2026-44458: honojs hono · Injection

Affects honojs honoSource CVE Database V5

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Not known to be exploited · CVSS 4.3 Medium : upgrade to 4.12.18 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.12.18
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade hono and honojs/hono to 4.12.18.

Affected software

ProductAffectedFixed in
honojshonoAffected
  • <4.12.18
Fixed in
  • 4.12.18
npmhonojs/honopkg:npm/honojs/honoOther threatsAffected
  • <4.12.18
Fixed in
  • 4.12.18

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to honojs hono version 4.12.18 or later, where this vulnerability has been fixed. No other mitigation is indicated or required.

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.

References

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