CVE-2026-72817

Name	CVE-2026-72817
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-github-go-chi-chi (PTS)	bookworm	5.0.7-1	vulnerable
	trixie	5.2.0-1	vulnerable
	forky, sid	5.3.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-go-chi-chi	source	(unstable)	5.3.0-1

Notes

[trixie] - golang-github-go-chi-chi <no-dsa> (Minor issue)
[bookworm] - golang-github-go-chi-chi <ignored> (Minor issue; out of LTS support)
[bullseye] - golang-github-go-chi-chi <ignored> (Minor issue; out of LTS support)
https://github.com/go-chi/chi/security/advisories/GHSA-9g5q-2w5x-hmxf