CVE-2026-62987

5.8 MEDIUMpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

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.
Prioritized remediation: Update to Fabio version 1.7.2 or later to apply the necessary fix for header protection.

header-manipulationsecurity-headerbackend-auditupdate-recommended

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Weaknesses

CWE-290, CWE-348

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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