CVE-2026-54171: Excon Project Excon

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Excon Project Excon: before 1.5.0 (fixed in 1.5.0)

Published 2026-07-17. Last modified 2026-07-29.