CVE-2018-3779
highpriority · track · 41EPSS 0.061 · 93 %ileEURUUSEPSS · scored 2026-10-27
active-support ruby gem 5.2.0 could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 9–10
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
- activesupport project activesupport= 5.2.0nvdUScpe:2.3:a:activesupport_project:activesupport:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-2j55-pcw5-x4h2active-support impersonates 'activesupport' gem2018-08-13ghsa · osvUS
The `active-support` ruby gem gem is malware and duplicates the official `activesupport` (no hyphen) gem, but adds a compiled extension. The extension attempts to resolve a base64 encoded domain (29faea63.planfhntage.de), downloads a payload, and executes. This trojan horse gem could allow a remote attacker to execute arbitrary code on the system, caused by containing a malicious backdoor. An attacker could exploit this vulnerability to execute arbitrary code on the system. No version of this gem should be considered safe.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (3)
External citations — patches, advisories, analysis.
- https://hackerone.com/reports/392311cnnvd
- https://hackerone.com/reports/392311enisa_euvd
- https://hackerone.com/reports/392311ExploitIssue TrackingThird Party Advisorynvd
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