PatchTheCVECVE-2025-48865: Fabio is an HTTP(S) and TCP router for deploying applications managed by consul
CVE-2025-48865 is a critical-severity flaw (CVSS 9.1) affecting fabio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should trust these headers, allowing HTTP clients to remove
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-48865?
fabio: upgrade to 1.6.6. Exact commands for each OS are on this page.
Is CVE-2025-48865 being exploited?
CVE-2025-48865 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-48865 affect?
CVE-2025-48865 affects fabio. Severity is critical (CVSS 9.1). Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop heade
How urgent is CVE-2025-48865?
Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action