What is CVE-2026-39825?

CVE-2026-39825 is a medium-severity vulnerability in Golang Go, classified under CWE-444: INCONSISTENT INTERPRETATION OF HTTP REQUESTS ('HTTP REQUEST/RESPONSE SMUGGLING'). CVSS score: 5.3/10. Published 2026-05-07.

How severe is CVE-2026-39825?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Golang Go

CVE-2026-39825

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…

EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Golang Go
Go Standard Library Net/http/httputil — versions 0, 1.26.0-0

References

security@golang.org (Patch)
security@golang.org (Issue Tracking)
security@golang.org (Release Notes)
security@golang.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-39825?: CVE-2026-39825 is a medium-severity vulnerability in Golang Go, classified under CWE-444: INCONSISTENT INTERPRETATION OF HTTP REQUESTS ('HTTP REQUEST/RESPONSE SMUGGLING'). CVSS score: 5.3/10. Published 2026-05-07.
How severe is CVE-2026-39825?: Medium severity. CVSS v3 base score is 5.3 out of 10.