redact additional sensitive/risky headers when following redirects
Published: June 03, 2026
SECURITY IDENTIFIERS
- CVE: CVE-2026-54171 (NVD)
- GHSA: GHSA-48rx-c7pg-q66r
GEM
SEVERITY
CVSS v3.x: 6.5 (Medium)
PATCHED VERSIONS
>= 1.5.0
DESCRIPTION
Impact
The redirect follower middleware previously failed to strip a number of headers that are known to be sensitive and did not provide a way to provide a custom list of headers to strip.
What kind of vulnerability is it? Who is impacted?
This could cause inadvertent leakage of sensitive data for users of the RedirectFollower middleware in cases where the initial request includes header information that is not intended for the new target.
Patches
Patch exists and is released in v1.5.0
Workarounds
Users can backport the fix (commit below) to a custom redirect follower middleware.
RELATED
- https://www.cve.org/CVERecord?id=CVE-2026-54171
- https://rubygems.org/gems/excon/versions/1.5.0
- https://github.com/excon/excon/releases/tag/v1.5.0
- https://github.com/excon/excon/blob/master/changelog.txt
- https://github.com/excon/excon/pull/901
- https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3
- https://github.com/excon/excon/security/advisories/GHSA-48rx-c7pg-q66r