CVE-2026-105221
Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification
defunkt gist
CVSS
9.1CriticalExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 7% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 6.1.0gistCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 1
- gistaffected: 4.0.0 before 6.1.0CVE List
References 5
- github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcfFixvia CVE List
- vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verificationAdvisoryvia CVE List
- github.com/defunkt/gist/issues/373Referencevia CVE List
- github.com/defunkt/gistReferencevia CVE List
- github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468Referencevia CVE List