Critical
gist — security advisory
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.
- Products
- gist
- Affected versions
- 4.4.2-1, 4.5.0-1, 4.5.0-2, 4.6.1-1, 5.0.0-2, 5.0.0-3, 5.0.0-4, 5.0.0-4ubuntu1, 6.0.0-2, 6.0.0-3, 6.0.0-3build1, 6.1.0-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-105221
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:39 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-105221
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
gist
Fixed versions: Not specified
Complete source record
{
"id": "2849d0f19c300779cd753951627445f807e40accf11f3e364515b97a34b987ff",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-105221",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-105221",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-105221",
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"aliases": [
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"metrics": [
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"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
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{
"type": "CVSS_V4",
"score": "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"
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{
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},
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"modified": "2026-10-17T12:58:42.478026029Z",
"provider": "osv",
"upstream": [
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],
"references": [
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},
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"source_id": "core-osv",
"document_id": 358975,
"published_at": "2026-10-04T23:16:00+00:00"
}