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CVE-2026-41683— HTTP response splitting and DoS in i18next-http-middleware via unsanitised Content-Language header

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之前版本存在跨站脚本漏洞，该漏洞源于将用户控制的语言值写入Content-Language响应标头时未正确清理回车、换行等控制字符，可能导致CRLF注入。

CVSS 8.6 · High EPSS 0.33% · P25

Affected Version Matrix 1

VendorProduct Version RangeStatus
i18next i18next-http-middleware < 3.9.3 affected
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I. Basic Information for CVE-2026-41683

Vulnerability Information
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Vulnerability Title
HTTP response splitting and DoS in i18next-http-middleware via unsanitised Content-Language header
Source: CVE Program / CVE List V5
Vulnerability Description
i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno. Prior to version 3.9.3, i18next-http-middleware wrote user-controlled language values into the Content-Language response header after passing them through utils.escape(), which is an HTML-entity encoder that does not strip carriage return, line feed, or other control characters. When the application used an older i18next (< 19.5.0) that still exercised the backward-compatibility fallback at LanguageDetector.js:100 or otherwise produced a raw detected value, CRLF sequences in the attacker-controlled lng parameter reached res.setHeader('Content-Language', ...) verbatim. This issue has been patched in version 3.9.3.
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
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
i18next-http-middleware 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于将用户控制的语言值写入Content-Language响应标头时未正确清理回车、换行等控制字符，可能导致CRLF注入。
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-2026-41683

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III. Intelligence Information for CVE-2026-41683

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Vendor Advisories for CVE-2026-41683 (1)

Same Patch Batch · i18next · 2026-05-08 · 4 CVEs total

CVE-2026-41690 8.6 HIGH Prototype pollution and path traversal in i18next-http-middleware via user-controlled lang
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-79

V. Comments for CVE-2026-41683

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