Go net/http/httputil ReverseProxy query parameter sanitization bypass
A flaw in Go's net/http/httputil ReverseProxy allowed query parameters to be forwarded to backend services even though they were not visible to proxy-side Rewrite logic, or to a Director function that parses query parameters. ReverseProxy sanitizes forwarded requests by removing parameters not parsed by url.ParseQuery, but it did not account for url.ParseQuery's total-parameter limit, controlled by GODEBUG=urlmaxqueryparams=N. An attacker could supply a query string with enough parameters to exceed that limit, causing trailing parameters to remain unparsed and therefore invisible to Rewrite or Director logic while still being forwarded upstream. The documented example is a query of the form "a1=x&a2=x&...&a10000=x&hidden=y", where "hidden=y" may be forwarded to the backend while being hidden from the proxy's request-rewrite processing.
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Cross-references every affected SKU, including bundled OEM variants.
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