CVE-2026-72815
Published:August 14, 2026
Updated:August 31, 2026
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.
Affected Packages
https://github.com/go-chi/chi.git (GITHUB):
Affected version(s) >=v5.2.1 <v5.3.0Fix Suggestion:
Update to version v5.3.0github.com/go-chi/chi/v5 (GO):
Affected version(s) >=v5.2.1 <v5.3.0Fix Suggestion:
Update to version v5.3.0Related Resources (6)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.40