Is CVE-2026-39825 in the CISA KEV catalog?

No. CVE-2026-39825 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-39825?

CVE-2026-39825 has a CVSS v3 base score of 5.3 (Moderate).

What is the EPSS score for CVE-2026-39825?

CVE-2026-39825 has an EPSS score of 0.39% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-39825?

Upgrade Go Programming Language to 1.26.3 or later.

CVE & CISA-KEV Catalog

CVE-2026-39825

MEDIUM

5.3

CVSS v3

NVD

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.

How to fix

Remediation Available

Go Programming LanguageWindows application

Affected:1.26.0 1.26.3Fixed in:1.26.3https://go.dev

Affected:1.25.10Fixed in:1.25.10https://go.dev

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Patch1

go.dev

Vendor Advisory1

pkg.go.dev

Issue Tracking1

go.dev

Release Notes1

groups.google.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.