CVE-2026-105221
Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification
- State
- Published
- Severity
- 9.1 Critical
- Published
- Oct 4, 2026
- Updated
- Oct 5, 2026
- Reserved
- Oct 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.1 Critical | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-295 Improper Certificate Validation
Affected Products
| Product | Versions |
|---|---|
gistdefunkt |
|
References
- GitHub Issue #373issue-tracking
- https://github.com/defunkt/gistproduct
- https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468technical-description
- https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcfpatch
- VulnCheck Advisory: Gist RubyGem before 6.1.0 Disabled TLS Certificate Verificationthird-party-advisory
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