CVE-2026-72815Medium· 6.9▾ TwilightPoC availablego-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Aug 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
1 GitHub repo
0.4% → 0.5%
— → 6.5
Last analysed / modified upstream
6.5 → 6.9
go-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, by supplying a spoofed IP address in the X-Forwarded-For header. The issue is fixed in version 5.3.0.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
github.com/go-chi/chi/v5/middleware >= 5.2.1, < 5.3.0Patched in:
github.com/go-chi/chi/v5/middleware 5.3.0Source: https://osv.dev/vulnerability/GHSA-3fxj-6jh8-hvhx
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-72816Medium· 6.5go-chi/chi through 5.2.1 contains an IP spoofing vulnerability in the RealIP middleware (middleware/realip.go)
CVE-2025-71405Medium· 5.1chi versions before v5.2.2 contain an open redirect vulnerability in the RedirectSlashes middleware function that uses the Host header to construct redirect URLs
CVE-2026-72817Medium· 6.5go-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 …
CVE-2026-114437Medium· 4.8chi: Client IP spoofing in ClientIPFromXFF via X-Forwarded-For
CVE-2026-114612Critical· 9.9LiteLLM: Privilege Escalation to Proxy Admin via Cross-Domain Reuse of the Salt Key
GHSA-3fxj-6jh8-hvhxMediumchi Has an IP Spoofing Vulnerability in `middleware.RealIP`