CVE-2026-72817GO-2026-5775GHSA-9G5Q-2W5X-HMXF
go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.3.0
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- go-chi chi
From 0.9.0 · fixed in 5.3.0
- github.com/go-chi/chi/middlewareGo
From 0.9.0 · through 1.5.5
- github.com/go-chi/chi/v2/middlewareGo
through 2.1.1
- github.com/go-chi/chi/v3/middlewareGo
through 3.3.5
- github.com/go-chi/chi/v4/middlewareGo
through 4.1.3
- github.com/go-chi/chi/v5/middlewareGo
fixed in 5.3.0
- github.com/go-chi/chi/v5Go
fixed in 5.3.0