Bug 2467823 (CVE-2026-39825) - CVE-2026-39825 net/http/httputil: golang: net/http/httputil: ReverseProxy forwards hidden query parameters, potentially bypassing security controls
Summary: CVE-2026-39825 net/http/httputil: golang: net/http/httputil: ReverseProxy for...
Keywords:
Status: NEW
Alias: CVE-2026-39825
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-07 20:02 UTC by OSIDB Bzimport
Modified: 2026-07-02 11:04 UTC (History)
146 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:22112 0 None None None 2026-06-01 01:04:19 UTC
Red Hat Product Errata RHSA-2026:22120 0 None None None 2026-06-01 00:43:51 UTC
Red Hat Product Errata RHSA-2026:22121 0 None None None 2026-06-01 01:00:52 UTC

Description OSIDB Bzimport 2026-05-07 20:02:00 UTC 
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.
Comment 2 errata-xmlrpc 2026-06-01 00:43:44 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:22120 https://access.redhat.com/errata/RHSA-2026:22120
Comment 3 errata-xmlrpc 2026-06-01 01:00:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:22121 https://access.redhat.com/errata/RHSA-2026:22121
Comment 4 errata-xmlrpc 2026-06-01 01:04:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:22112 https://access.redhat.com/errata/RHSA-2026:22112
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