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CVE-2026-44458

Hono: CSS Declaration Injection via Style Object Values in JSX SSR

Published: May 13, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-74
4.3MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 90.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-74CWE-116

Affected Products

honojs
oss-projectaka hono
honoLibrary
OSS Libraries / web-framework
hono
oss-projectaka hono js
honoLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/honojs/hono/security/advisories/GHSA-qp7p-654g-cw7p
github.com

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