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CVE-2026-44455— Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection

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 4.12.16之前版本存在注入漏洞，该漏洞源于hono/jsx中JSX元素标签名处理不当，可能导致未验证的标签名直接插入生成的HTML输出中，从而注入非预期的HTML。

CVSS 4.7 · Medium EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
honojs hono < 4.12.16 affected
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I. Basic Information for CVE-2026-44455

Vulnerability Information
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Vulnerability Title
Hono: Unvalidated JSX Tag Names in hono/jsx May Allow HTML Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.16, Improper handling of JSX element tag names in hono/jsx allowed unvalidated tag names to be directly inserted into the generated HTML output. When untrusted input is used as a tag name via the programmatic jsx() or createElement() APIs during server-side rendering, specially crafted values may break out of the intended element context and inject unintended HTML. This vulnerability is fixed in 4.12.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/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 4.12.16之前版本存在注入漏洞，该漏洞源于hono/jsx中JSX元素标签名处理不当，可能导致未验证的标签名直接插入生成的HTML输出中，从而注入非预期的HTML。
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 < 4.12.16 -

II. Public POCs for CVE-2026-44455

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III. Intelligence Information for CVE-2026-44455

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Vendor Advisories for CVE-2026-44455 (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-2026-44458 4.3 MEDIUM Hono: CSS Declaration Injection via Style Object Values in JSX SSR
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-2026-44455

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