CVE-2026-72816GO-2026-5777GHSA-RJR7-JGGH-PGCP
go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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: poc
- Automatable: yes
- Technical impact: partial
Summary
go-chi/chi through 5.2.1 contains an IP spoofing vulnerability in the RealIP middleware (middleware/realip.go). The realIP() function reads client-controlled headers (True-Client-IP, X-Real-IP, and X-Forwarded-For) and overwrites r.RemoteAddr without verifying that the request originated from a trusted proxy. Attackers can supply arbitrary IP addresses in these headers to bypass IP-based access controls, evade rate limiting and geo-IP restrictions, and pollute audit logs. Fixed in 5.3.0.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: poc · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- go-chi chi
fixed in 5.3.0
- github.com/go-chi/chi/middlewareGo
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