CVE-2026-72817CWE-345

CVE-2026-72817

Medium · published August 14, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
14.5
In the wild
Unconfirmed
What it is

go-chi/chi versions 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00242 · 14.5th percentile
Weakness
CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-08-14T16:16Z
References (2)
https://github.com/go-chi/chi/security/advisories/GHSA-9g5q-2w5x-hmxf · [email protected]https://www.vulncheck.com/advisories/go-chi-chi-before-ip-spoofing-via-x-forwarded-for · [email protected]
EPSS history
Timeline
  • 14 AUG 11:35Z
    go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
    cvelistv5