CVE-2026-55603— Steven Chim http-proxy-middleware 输入验证错误漏洞

http-proxy-middleware: multipart/form-data field injection via unescaped CRLF in `fixRequestBody`

http-proxy-middleware is node.js http-proxy middleware. From 3.0.4 until 3.0.7 and 4.1.1, fixRequestBody() is the library's documented helper for re-emitting a request body that was already consumed by a body parser. When the outgoing Content-Type is multipart/form-data, it rebuilds the body with handlerFormDataBodyData(), which interpolates each req.body key and value directly into the multipart wire format without neutralizing CR/LF. A \r\n inside a value (or key) lets an attacker close the current part and inject an entirely new form part. Because the proxy's own body parser saw a single opaque value, any gateway-side policy or validation performed on req.body is evaluated against a different set of fields than the upstream backend ultimately parses a request/parameter desynchronization across the trust boundary. This vulnerability is fixed in 3.0.7 and 4.1.1.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N

对CRLF序列的转义处理不恰当(CRLF注入)

Steven Chim http-proxy-middleware 输入验证错误漏洞

chimurai http-proxy-middleware是chimurai个人开发者开源的一个Node.js的HTTP代理中间件。 Steven Chim http-proxy-middleware 3.0.7之前版本和4.1.1之前版本存在输入验证错误漏洞，该漏洞源于fixRequestBody()函数在处理multipart/form-data的Content-Type时，未正确中和对CR/LF，可能导致攻击者注入新的表单部分，造成请求或参数反同步。

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