CVE-2026-39825— ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil
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I. Basic Information for CVE-2026-39825
Vulnerability Information
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Vulnerability Title
ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于未考虑ParseQuery对查询参数总数的限制，可能导致转发包含Rewrite函数不可见参数的请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Go standard library | net/http/httputil | 0 ~ 1.25.10 | - |
II. Public POCs for CVE-2026-39825
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|---|
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Same Patch Batch · Go standard library · 2026-05-07 · 7 CVEs total
| CVE-2026-42499 | Quadratic string concatenation in consumePhrase in net/mail | |
| CVE-2026-39836 | Panic in Dial and LookupPort when handling NUL byte on Windows in net | |
| CVE-2026-39826 | Escaper bypass leads to XSS in html/template | |
| CVE-2026-39823 | Bypass of meta content URL escaping causes XSS in html/template | |
| CVE-2026-39820 | Quadratic string concatentation in consumeComment in net/mail | |
| CVE-2026-33811 | Crash when handling long CNAME response in net |
IV. Related Vulnerabilities
Same vendor: Go standard library
- CVE-2026-39820
Quadratic string concatentation in consumeComment in net/mai - CVE-2026-39823
Bypass of meta content URL escaping causes XSS in html/templ - CVE-2026-42499
Quadratic string concatenation in consumePhrase in net/mail - CVE-2026-39826
Escaper bypass leads to XSS in html/template - CVE-2026-33811
Crash when handling long CNAME response in net
V. Comments for CVE-2026-39825
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