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CVE-2026-44458— Hono: CSS Declaration Injection via Style Object Values in JSX SSR

Quick assessment

Affected
honojs hono
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.18之前版本存在注入漏洞，该漏洞源于JSX渲染器对样式属性对象值进行HTML转义但未进行CSS转义，可能导致非预期输入在样式属性中注入额外的CSS声明。

CVSS 4.3 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.18 affected
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I. Basic Information for CVE-2026-44458

Vulnerability Information
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Vulnerability Title
Hono: CSS Declaration Injection via Style Object Values in JSX SSR
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Hono 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hono是Hono社区的一个用 TypeScript 编写的 Web 框架。 Hono 4.12.18之前版本存在注入漏洞，该漏洞源于JSX渲染器对样式属性对象值进行HTML转义但未进行CSS转义，可能导致非预期输入在样式属性中注入额外的CSS声明。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
honojs hono < 4.12.18 -

II. Public POCs for CVE-2026-44458

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III. Intelligence Information for CVE-2026-44458

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Vendor Advisories for CVE-2026-44458 (1)

Same Patch Batch · honojs · 2026-05-13 · 5 CVEs total

CVE-2026-44456 6.5 MEDIUM Hono: bodyLimit() can be bypassed for chunked / unknown-length requests
CVE-2026-44457 5.3 MEDIUM Hono: Cache Middleware ignores Vary: Authorization / Vary: Cookie leading to cross-user ca
CVE-2026-44455 4.7 MEDIUM Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection
CVE-2026-44459 3.8 LOW Hono: Improper validation of NumericDate claims (exp, nbf, iat) in JWT verify()

IV. Related Vulnerabilities

Same product: hono
Same vendor: honojs
Same weakness: CWE-74

V. Comments for CVE-2026-44458

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