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CVE Vulnerability Details :
CVE-2026-39825
PUBLISHED
More InfoOfficial Page
Assigner-Go
Assigner Org ID-1bb62c36-49e3-4200-9d77-64a1400537cc
View Known Exploited Vulnerability (KEV) details
Published At-07 May, 2026 | 19:41
Updated At-08 May, 2026 | 21:30
Rejected At-
▼CVE Numbering Authority (CNA)
ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil

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.

Affected Products
Vendor
Go standard library
Product
net/http/httputil
Collection URL
https://pkg.go.dev
Package Name
net/http/httputil
Program Routines
  • cleanQueryParams
  • ReverseProxy.ServeHTTP
Default Status
unaffected
Versions
Affected
  • From 0 before 1.25.10 (semver)
  • From 1.26.0-0 before 1.26.3 (semver)
Problem Types
TypeCWE IDDescription
N/AN/ACWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Type: N/A
CWE ID: N/A
Description: CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://go.dev/cl/770541
N/A
https://go.dev/issue/78948
N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
N/A
https://pkg.go.dev/vuln/GO-2026-4976
N/A
Hyperlink: https://go.dev/cl/770541
Resource: N/A
Hyperlink: https://go.dev/issue/78948
Resource: N/A
Hyperlink: https://groups.google.com/g/golang-announce/c/qcCIEXso47M
Resource: N/A
Hyperlink: https://pkg.go.dev/vuln/GO-2026-4976
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found