CVE-2026-33555
MediumCVSS 4.0Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
In HAProxy before version 3.3.6, a vulnerability was found in the HTTP/3 parser. It does not verify that the received body length matches a previously declared Content-Length header when the stream is closed via a frame with an empty payload. The issue exists since version 2.6.
Risk Assessment
This vulnerability can cause desynchronization between HAProxy and the backend server, enabling request smuggling attacks. An attacker could smuggle malicious requests, potentially gaining access to other users' data or bypassing security mechanisms.
Recommendation
Immediately upgrade HAProxy to version 3.3.6 or later. If an upgrade is not possible, consider temporarily disabling HTTP/3 support or applying WAF rules to block suspicious requests.
Other vulnerabilities in HAProxy
See all- CVE-2016-5360High
HAproxy 1.6.x before 1.6.6, when a deny comes from a reqdeny rule, allows remote attackers to cause a denial of service (uninitialized memory access and crash) or possibly have unspecified other impact via unknown vectors.
- CVE-2026-26081Medium
HAProxy Community Edition versions 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.
- CVE-2026-26080Low
HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.
- CVE-2026-55204High
HAProxy up to version 3.4.0 contains a null pointer dereference vulnerability in the hpack_dht_insert() function in src/hpack-tbl.c. The flaw occurs when hpack_dht_defrag() returns null due to memory pool exhaustion and its return value is not validated. An attacker can exploit this by triggering HPACK dynamic table insertions under memory pressure, causing HAProxy worker processes to crash and resulting in denial of service.
- CVE-2026-55203High
HAProxy up to version 3.4.0 contains an integer overflow vulnerability in the fcgi_conn structure's drl field. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect buffer parsing as new FCGI record headers. This allows malicious FastCGI backends to desynchronize the FCGI framing parser.
- CVE-2023-40225High
HAProxy versions from 2.0.32 to 2.6.14 and from 2.7.0 to 2.8.1 forward empty Content-Length headers, violating RFC 9110 section 8.6. In rare cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request.
Original NVD description (English source)
An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body length matches a previously announced content-length when the stream is closed via a frame with an empty payload. This can cause desynchronization issues with the backend server and could be used for request smuggling. The earliest affected version is 2.6.