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CVE-2026-39825— ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil

Quick assessment

Affected
Go standard library net/http/httputil
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Go standard library net/http/httputil < 1.25.10 affected
1.26.0-0< 1.26.3 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-39825

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Patches & Fixes for CVE-2026-39825 (1)

Vendor Advisories for CVE-2026-39825 (2)

Vendor Pages for CVE-2026-39825 (1)

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 product: net/http/httputil
Same vendor: Go standard library

V. Comments for CVE-2026-39825

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