CVE-2026-105221
Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-295 |
| Vendor | defunkt |
| Product | gist |
| Published | Oct 4, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
defunkt / gist
4.0.0 < 6.1.0
References
github.com: https://github.com/defunkt/gist/issues/373 github.com: https://github.com/defunkt/gist github.com: https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468 github.com: https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcf vulncheck.com: https://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verification
Credits
Siyang Wu