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CVE-2026-62987— Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header

Quick assessment

Affected
fabiolb fabio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 ClientIPHead

CVSS 5.8 · Medium EPSS 0.16% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
fabiolb fabio >= 1.6.6, < 1.7.2 affected
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I. Basic Information for CVE-2026-62987

Vulnerability Information

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Vulnerability Title
Fabio - Incomplete fix for CVE-2025-48865: operator-configured trust headers (clientip/tls/requestid) still strippable via the Connection header
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
fabiolb fabio >= 1.6.6, < 1.7.2 -

II. Public POCs for CVE-2026-62987

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III. Intelligence Information for CVE-2026-62987

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Patches & Fixes for CVE-2026-62987 (1)

Other References for CVE-2026-62987 (2)

IV. Related Vulnerabilities

Same product: fabio
Same vendor: fabiolb
Same weakness: CWE-290

V. Comments for CVE-2026-62987

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