CVE-2026-105221
Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification
CRITICAL 9.1EPSS 0.2%
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.
- Affected
- defunkt · gist
- CVSS v4.0 VULNCHECK
- 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/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 - CVSS v3.1 VULNCHECK
- 7.4 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - EPSS
- 0.18% chance of exploitation in the next 30 days, 7th percentile
- Published
- 2026-10-04
- Updated
- 2026-10-05
Proof-of-concept exploits (1)
- abraxas/cve-2026-105221-gist-tls0★ · 2026-10-07