Vulnerability Description
Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-configured ClientIPHeader, TLSHeader, and RequestID names. In proxy/http_proxy.go, HTTPProxy.ServeHTTP calls addHeaders to set these trust headers before Go ReverseProxy processes the inbound Connection header, allowing an unauthenticated client to name and remove the configured headers before the request reaches the backend. Deployments that enable the corresponding proxy.header options can therefore lose client-IP, TLS-termination, or request-correlation signals used by backend authorization and auditing; the options are empty by default, and the hardcoded protected forwarded headers are unaffected. This issue is fixed in version 1.7.2.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357
- https://github.com/fabiolb/fabio/releases/tag/v1.7.2
- https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v
- https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v
FAQ
What is CVE-2026-62987?
CVE-2026-62987 is a vulnerability with a CVSS score of 5.8 (MEDIUM). Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forw...
How severe is CVE-2026-62987?
CVE-2026-62987 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62987?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.