CVE-2011-2705: Ruby-Lang Ruby

Medium severity, CVSS 5.0. EPSS: 2.2% chance of exploitation in the next 30 days.

The SecureRandom.random_bytes function in lib/securerandom.rb in Ruby before 1.8.7-p352 and 1.9.x before 1.9.2-p290 relies on PID values for initialization, which makes it easier for context-dependent attackers to predict the result string by leveraging knowledge of random strings obtained in an earlier process with the same PID.

Affected products

• Ruby-Lang Ruby: up to and including 1.8.7-334; version 1.8.7 only; version 1.8.7-160 only; version 1.8.7-173 only; version 1.8.7-248 only; version 1.8.7-249 only; …

Published 2011-08-05. Last modified 2026-06-16.