medium6.5
CVE-2026-54171
Excon does not redact additional sensitive/risky headers when following redirects
Impact
Excon is usable, fast, simple HTTP 1.1 for Ruby. Prior to 1.5.0, Excon's RedirectFollower middleware failed to strip additional sensitive headers when following redirects and did not provide a custom list of headers to strip. This could cause inadvertent leakage of sensitive data when the initial request includes header information that is not intended for the new target. This issue is fixed in version 1.5.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | excon | < 1.5.0 | 1.5.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Excon Project | Excon | before 1.5.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-48rx-c7pg-q66r
- https://github.com/excon/excon/security/advisories/GHSA-48rx-c7pg-q66r
- https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/excon/CVE-2026-54171.yml
- https://www.cve.org/CVERecord?id=CVE-2026-54171
- https://nvd.nist.gov/vuln/detail/CVE-2026-54171
- https://github.com/excon/excon/pull/901