[GHSA-4www-5p9h-95mh] http-proxy-middleware can call writeBody twice because "else if" is not used#5486
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CVE-2025-32996 is not applicable until 1.3.0. The CVE relates to a function called
fixRequestBodywhich takes the request body and makes sure that the request body is written in the right format. For example - if thecontent-typeis JSON - it will write the body as a JSON. If it ismultipart/form-datait will write the body is form-data. The vulnerability allows to write the body as both JSON and form-data and lead to exploits. The functionality offixRequestBodywas not existed until 1.3.0.The code was added in v1.3.0:
https://github.com/chimurai/http-proxy-middleware/tree/v1.3.0/src/handlers
In the following Pull Request:
chimurai/http-proxy-middleware#492