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Advisory record · GHSA-fq95-v8xc-jm3v

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

CVSS 5.8 MediumEPSS 0.0020 · 10th percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/fabiolb/fabioGo>=1.6.6, <1.7.21.7.2
Identifiers
GHSA-fq95-v8xc-jm3v · CVE-2026-62987 · GO-2026-6566
Weakness (CWE)
CWE-290 · CWE-348
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Fabio versions 1.6.6 through 1.7.1 are affected. When an operator enables the client IP, TLS, or request ID headers, a remote unauthenticated client can list those header names in the Connection header, causing the proxy to strip them before the request reaches the backend. A backend relying on those headers could then see a spoofed or missing client IP, incorrect TLS status, or lost request correlation. Upgrade to Fabio 1.7.2, which is the fixed version.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.8 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.