{"id":"CVE-2026-105221","aliases":["EUVD-2026-92134","GHSA-phqh-xp3p-h6mr","UBUNTU-CVE-2026-105221"],"status":"published","title":"Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification","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.","severity":{"version":"4.0","score":9.1,"vector":"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00226,"percentile":0.13501,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-295"],"published":"2026-10-04T22:31:47Z","modified":"2026-11-11T02:48:40Z","exploits":[{"source":"pocgithub","id":"abraxas/cve-2026-105221-gist-tls","title":"abraxas/cve-2026-105221-gist-tls","date":"2026-10-06","url":"https://github.com/abraxas/cve-2026-105221-gist-tls"}],"affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.2-1","4.5.0-1","4.5.0-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-2","5.0.0-3","5.0.0-4","5.0.0-4ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.0-2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.0-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.0-3build1","6.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"gist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.0-3","6.0.0-3build1"]}],"products":[{"vendor":"defunkt","product":"gist"}],"references":[{"url":"https://github.com/defunkt/gist/issues/373","tags":["issue-tracking","report"]},{"url":"https://github.com/defunkt/gist","tags":["product","package"]},{"url":"https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468","tags":["technical-description","article"]},{"url":"https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcf","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verification","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105221","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-phqh-xp3p-h6mr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105221.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-105221","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-105221","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-105221","title":"Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification","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.","status":"published","published":"2026-10-04T22:31:47.153Z","modified":"2026-10-05T20:28:43.344Z","cvss":[{"version":"4.0","score":9.1,"vector":"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","level":"critical","assessor":"cna"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:19:56.755658Z"}],"euvd":[{"id":"EUVD-2026-92134","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.","status":"published","published":"2026-10-04T22:31:47Z","modified":"2026-10-05T20:28:43Z","cvss":[{"version":"4.0","score":9.1,"vector":"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","level":"critical"}],"updated_at":"2026-11-02T17:27:39.05741Z"}],"ghsa":[{"id":"GHSA-phqh-xp3p-h6mr","title":"The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that...","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.","status":"published","published":"2026-10-05T00:30:25Z","modified":"2026-10-05T00:30:26Z","cvss":[{"version":"4.0","score":9.1,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:12:47.41114Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-10-04T23:16:59.77Z","modified":"2026-10-06T16:08:43.18Z","cvss":[{"version":"4.0","score":9.1,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"critical","assessor":"secondary"},{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:12:53.75133Z"}],"osv":[{"id":"CVE-2026-105221","title":"Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification","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.","status":"published","published":"2026-10-04T22:31:47.153Z","modified":"2026-11-11T10:47:22.981891826Z","cvss":[{"version":"4.0","score":9.1,"vector":"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","level":"critical"}],"cwes":["CWE-295"],"updated_at":"2026-11-11T03:22:04.464623Z"},{"id":"UBUNTU-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.","status":"published","published":"2026-10-04T23:16:00Z","modified":"2026-10-17T12:58:42.478026029Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"},{"version":"4.0","score":9.1,"vector":"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","level":"critical"}],"updated_at":"2026-11-02T16:55:59.130573Z"}]}}