CVE-2026-105221

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 13.2% of scored records. A rank, not a probability.

NVD base score

9.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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

NVD analysis status

Deferred. NVD last modified this record on 2026-10-06.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-04 22:31Z24 DAYS AGO

Last updated

2026-10-05 20:28Z23 DAYS AGO

Reserved

2026-10-04

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.1)

CNA CVSS 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

Weaknesses

• CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

92a8597a7b3c255c0dedd07800b84471675bc1b66df2fe1d92f9f1f9e7ac9c59

• github.comGitHub Issue #373https://github.com/defunkt/gist/issues/373issue-tracking
• github.comhttps://github.com/defunkt/gistproduct
• github.comhttps://github.com/defunkt/gist/blob/v6.0.0/lib/gist.rb#L466-L468technical-description
• github.comhttps://github.com/defunkt/gist/commit/07ccc1a6d46e9d36f0e85d0b1c5d795890ae6bcfpatch
• www.vulncheck.comVulnCheck Advisory: Gist RubyGem before 6.1.0 Disabled TLS Certificate Verificationhttps://www.vulncheck.com/advisories/gist-rubygem-before-6.1.0-disabled-tls-certificate-verificationthird-party-advisory