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CVE-2019-13589

32
FAUCET Score

CVE-2019-13589 describes a critical code-execution backdoor discovered in version 1.1.6 of the Ruby paranoid2 gem, distributed via RubyGems.org, affecting anjlab paranoid2 products. This vulnerability carries a CVSS score of 9.8 (CRITICAL) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While the vulnerability is severe, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage. Users are advised to downgrade to version 1.1.5 or earlier to mitigate this risk.

Impacted Technologies

VendorProductVersion(s)CPE
1.1.6CPE matchmatch criteria
cpe:2.3:a:anjlab:paranoid2:1.1.6:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.35%
Probability of exploitation in next 30 days
EPSS Percentile
90.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0435 is in the 84th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

rubygemsGHSA-4g4c-8gqh-m4vmcritical

paranoid2 gem Code backdoor

Jul 16, 2019

References

github.com / rubygems/rubygems.org/issues/2051
ExploitIssue TrackingThird Party Advisory
rubygems.org / gems/paranoid2/versions
Vendor Advisory
snyk.io / vuln/SNYK-RUBY-PARANOID2-451600
Third Party Advisory
securityfocus.com / bid/109281
Third Party AdvisoryVDB Entry