What is CVE-2026-114437?

CVE-2026-114437 is a medium-severity vulnerability in Go-Chi Chi, classified under CWE-348. CVSS score: 4.8/10. Published 2026-10-21.

How severe is CVE-2026-114437?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Go-Chi Chi

CVE-2026-114437

In the Golang Chi web framework, the ClientIPFromXFF middleware skips any X-Forwarded-For entry in a configured trusted CIDR but never verifies that the direct TCP peer in http.Request.RemoteAddr belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by middleware.GetClientIP. This issue affects chi before 5.4.0.

Published 2026-10-21 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Go-Chi Chi

Weakness classification (CWE)

CWE-348

References

Frequently asked questions

What is CVE-2026-114437?: CVE-2026-114437 is a medium-severity vulnerability in Go-Chi Chi, classified under CWE-348. CVSS score: 4.8/10. Published 2026-10-21.
How severe is CVE-2026-114437?: Medium severity. CVSS v3 base score is 4.8 out of 10.