Is CVE-2026-105221 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-105221?

CVE-2026-105221 has a CVSS v3 severity of HIGH (7.4).

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CVE-2026-105221

Description

The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that allows on-path attackers to intercept HTTPS traffic because http_connection in lib/gist.rb sets VERIFY_NONE. Attackers can present any certificate to read or modify GitHub API traffic, stealing OAuth tokens and login credentials to read and modify the victim's gists.