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CVE-2026-39825 is an inconsistent HTTP request interpretation flaw in Go's net/http/httputil ReverseProxy. When ReverseProxy is configured with a Rewrite function, or with a Director function that parses query parameters, it sanitizes forwarded queries based on parameters parsed by url.ParseQuery. ParseQuery enforces a total-query-parameter limit controlled by GODEBUG=urlmaxqueryparams=N, but ReverseProxy does not account for that limit during sanitization. An attacker can submit sufficiently many benign query parameters to reach the parsing limit, followed by an additional parameter that is not visible to the Rewrite or Director logic but remains in the request forwarded to the upstream service. This creates a parser differential between proxy security logic and the backend request handling.
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90 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by TencentOS security advisory TSSA-2026-0888; technical details are not provided.
A security-control-bypass vulnerability in Go's net/http/httputil ReverseProxy, which forwards hidden query parameters.
A security-control-bypass vulnerability in Go's net/http/httputil ReverseProxy, which forwards hidden query parameters.
A security-control bypass in Go's net/http/httputil ReverseProxy, which can forward hidden query parameters.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.