{"id":"CVE-2026-105221","title":"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","summary":"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 certifica…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-295"],"vendor":"defunkt","product":"gist","affected":["gist >= 4.0.0 < 6.1.0"],"published":"2026-10-04","updated":"2026-10-06","sourceUpdated":"2026-10-06T16:08:43.180","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-105221","references":[{"url":"https://github.com/defunkt/gist","label":"disclosure@vulncheck.com"},{"url":"https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468","label":"disclosure@vulncheck.com"},{"url":"https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcf","label":"disclosure@vulncheck.com"},{"url":"https://github.com/defunkt/gist/issues/373","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verification","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-105221.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-105221"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-105221"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105221"}],"tags":["nvd","exploit-available","cve.org","csaf","vex","red-hat"],"epss":0.00226,"epssPercentile":0.13285,"exploits":{"github":1,"githubRepos":["https://github.com/abraxas/cve-2026-105221-gist-tls"],"checkedAt":"2026-10-27T16:54:25.831Z"},"exploitAvailable":true,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-05T19:18:30.694491Z"},"ingestedAt":"2026-10-04T23:05:36.217Z","slug":"CVE-2026-105221","body":"## Overview\n\nThe 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-10-06 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-105221.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":216576,"id":"CVE-2026-105221","ts":1791306631961,"field":"exploit_available","old":"false","new":"true"}]}