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CVE-2026-41690— Prototype pollution and path traversal in i18next-http-middleware via user-controlled language and namespace parameters

Quick assessment

Affected
i18next i18next-http-middleware
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.

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。

CVSS 8.6 · High EPSS 0.47% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
i18next i18next-http-middleware < 3.9.3 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-41690

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Vendor Advisories for CVE-2026-41690 (1)

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 product: i18next-http-middleware
Same vendor: i18next
Same weakness: CWE-22

V. Comments for CVE-2026-41690

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