CVE detail
CVE-2026-39825
ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewrite function, or a Director function which parses query parameters, ReverseProxy sanitizes the forwarded request to remove query parameters which are not parsed by url.ParseQuery. ReverseProxy does not take ParseQuery's limit on the total number of query parameters (controlled by GODEBUG=urlmaxqueryparams=N) into account. This can permit ReverseProxy to forward a request containing a query parameter that is not visible to the Rewrite function. For example, the query "a1=x&a2=x&...&a10000=x&hidden=y" can forward the parameter "hidden=y" while hiding it from the proxy's Rewrite function.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 17.9 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
5 source links · newest first
- CVE-2026-39825 ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputilMicrosoft MSRC
Information published.
vendormsrc.microsoft.comMay 10, 2026, 8:02 AM - https://pkg.go.dev/vuln/GO-2026-4976pkg.go.dev
No excerpt available.
Exploitpkg.go.devMay 7, 2026, 8:16 PM - https://groups.google.com/g/golang-announce/c/qcCIEXso47Mgroups.google.com
No excerpt available.
Patchgroups.google.comMay 7, 2026, 8:16 PM No excerpt available.
Vendor Advisorygo.devMay 7, 2026, 8:16 PM- https://go.dev/cl/770541go.dev
No excerpt available.
Vendor Advisorygo.devMay 7, 2026, 8:16 PM
Exploit code
Public exploit repository references
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0 repository references · best confidence N/A · max 0 stars
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