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High · 7.3 Public exploit CVE-2023-25950 EUVD-2023-29838GHSA-g72c-cx82-64hq

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 u…

Published Apr 11, 2023 · Updated Feb 11, 2025 · Assigned by jpcert

Vendor: HAProxy Product: HAProxy Package: haproxy Ecosystem: Debian

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.

Affected products

VendorProductAffectedFixed
HAProxy Technologies HAProxy version 2.7.0, and version 2.6.1 to 2.6.7 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 haproxy 2.6.8-1 —
Debian 13 haproxy 2.6.8-1 —
Debian 12 haproxy 2.6.8-1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • dhmosfunk/HTTP3ONSTEROIDS ★ 11 · Jul 31, 2023

    HTTP3ONSTEROIDS - A research on CVE-2023-25950 where HAProxy's HTTP/3 implementation fails to block a malformed HTTP header field name.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 1

References