{"id":"CVE-2026-62987","published":"2026-09-21T17:17:38.340","lastModified":"2026-09-21T19:17:08.173","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.","cvssScore":5.8,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","cwes":["CWE-290","CWE-348"],"vendors":[],"products":[],"references":[{"url":"https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","tags":[]},{"url":"https://github.com/fabiolb/fabio/releases/tag/v1.7.2","tags":[]},{"url":"https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","tags":[]},{"url":"https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","tags":[]}],"exploitRefs":[{"url":"https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357","tags":[]},{"url":"https://github.com/fabiolb/fabio/releases/tag/v1.7.2","tags":[]},{"url":"https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","tags":[]},{"url":"https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows unauthenticated clients to manipulate or remove critical headers like ClientIPHeader, TLSHeader, and RequestID before they reach the backend service, potentially undermining security measures.","exploitability":"Exploitation requires enabling specific proxy.header options but is relatively straightforward given the preconditions of those options being set.","blast_radius":"If exploited, this could lead to unauthorized access or manipulation of sensitive information in backend services, impacting security and auditing capabilities.","remediation":"Update to Fabio version 1.7.2 or later to apply the necessary fix for header protection.","tags":["header-manipulation","security-header","backend-audit","update-recommended"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:23:49.310Z"}}