by Kastro
Paper/Archive/CVE-2026-105221

CVE-2026-105221

defunkt gist — Gist RubyGem before 6.1.0 Disabled TLS Certificate Verification

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
30
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 13.4.134 × 202.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
gist4.0.0 – < 6.1.06.1.0CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/defunkt/gist/issues/373refgithub.com/defunkt/gistwriteupgithub.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468patchgithub.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcfwriteupvulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verification