CVE-2026-41690— Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters
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I. Basic Information for CVE-2026-41690
Vulnerability Information
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Vulnerability Title
Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters
Source: NVD (National Vulnerability Database)
Vulnerability Description
18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Versions prior to 3.9.3 allow an unauthenticated HTTP client to pollute Object.prototype in the Node.js process hosting the middleware, via two unvalidated entry points that reach internal object-key writes: getResourcesHandler and missingKeyHandler. This can break authorisation checks (if (user.isAdmin) returning true for any user), cause type-confusion DoS, and depending on downstream code it can be chained into RCE.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
Vulnerability Title
i18next-http-middleware 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
i18next-http-middleware是i18next开源的一个用于Node.js和Deno的HTTP国际化中间件。 i18next-http-middleware 3.9.3之前版本存在路径遍历漏洞，该漏洞源于getResourcesHandler和missingKeyHandler两个未验证入口点导致Object.prototype污染，可能破坏授权检查、导致类型混淆拒绝服务，并可能链式利用实现远程代码执行。
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 |
|---|---|---|---|---|
| i18next | i18next-http-middleware | < 3.9.3 | - |
II. Public POCs for CVE-2026-41690
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · i18next · 2026-05-08 · 4 CVEs total
| CVE-2026-41683 | 8.6 HIGH | HTTP response splitting and DoS in i18next-http-middleware via unsanitised Content-Languag |
| CVE-2026-41693 | 8.2 HIGH | i18next-fs-backend: Path traversal via unsanitised lng/ns allows arbitrary file read/overw |
| CVE-2026-42353 | 8.2 HIGH | Path traversal / SSRF in i18next-http-middleware via user-controlled language and namespac |
IV. Related Vulnerabilities
Same vendor: i18next
- CVE-2026-41693
i18next-fs-backend: Path traversal via unsanitised lng/ns al - CVE-2026-42353
Path traversal / SSRF in i18next-http-middleware via user-co - CVE-2026-41683
HTTP response splitting and DoS in i18next-http-middleware v - CVE-2026-41691
i18next-http-backend has Path Traversal & URL Injection via - CVE-2026-41692
i18nextify is vulnerable to DOM XSS via javascript:/data: UR
Same weakness: CWE-22
- CVE-2026-8274
npitre cramfs-tools Directory cramfsck.c do_directory path t - CVE-2022-50956
WordPress Plugin amministrazione-aperta 3.7.3 Local File Rea - CVE-2026-8215
Industrial Application Software IAS Canias ERP RMI iasReques - CVE-2026-42605
AzuraCast: Path Traversal in `currentDirectory` Parameter En - CVE-2026-42574
apko dirFS has a symlink-following path traversal that allow
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