CVE-2026-105221
The gist RubyGem before 6.1.0 contains an improper certificate validation vulnerability that allows…
- Risk score
- 51/100
- CVSS
- 7.4 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 4 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 credentia…
- Affected
- See advisory
- Fix
- Upgrade the product to 6.1.0 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.4 high
- Remotely exploitable without logging in
References
- https://github.com/defunkt/gist
- https://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468
- https://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcf
- https://github.com/defunkt/gist/issues/373
- https://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verification
Original 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.
Last activity 4 Oct 2026. Patch Forecast updates every hour.