Vendor scorecard
HAProxy
HAProxy security disclosure record — CVE volume, CVSS severity mix and product-category breakdown, sourced from the NIST NVD.
CPE: haproxy
Product families
1
Open in latest
14
Inferred — see methodology
Last disclosure
Jun 18, 2026
01
Product categories
1 trackedCVE volume, severity mix and the inferred latest shipping version per category.
| Category | CVEs | Volume | Severity mix | Open | Inferred latest |
|---|---|---|---|---|---|
| HAProxyApplication Delivery / ADChaproxy, haproxy_enterprise, aloha… | 36 | 14 | 3.1.12MED |
02
Recent CVEs
12 shownMost recently published, newest first. Each ID links to its NVD record.
| CVE | Severity | CVSS | Summary | Published |
|---|---|---|---|---|
| CVE-2026-55204(opens NVD record) | High | 7.5 | HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dht_insert() within src/hpack-tbl.c that fails to validate the return value of hpack_dht_defrag() when the memory pool is exhausted. An attacker can trigger HPACK dynamic table insertions under memory pressure to dereference a NULL pointer and crash HAProxy worker processes, causing denial of service. | Jun 18, 2026 |
| CVE-2026-55203(opens NVD record) | High | 7.5 | HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow vulnerability in the fcgi_conn structure's drl field that allows buffer misparse as new FCGI record headers. When contentLength is 65535 and paddingLength is 1 or more, the drl field wraps to 0, causing incorrect record consumption and allowing malicious FastCGI backends to desynchronize the FCGI framing parser, potentially causing request routing errors, response smuggling, or memory safety issues. | Jun 18, 2026 |
| CVE-2026-33555(opens NVD record) | Medium | 4.0 | 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. | Apr 13, 2026 |
| CVE-2025-11230(opens NVD record) | High | 7.5 | Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests. | Nov 19, 2025 |
| CVE-2024-45506(opens NVD record) | High | 7.5 | HAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service for HTTP/2 zero-copy forwarding (h2_send loop) under a certain set of conditions, as exploited in the wild in 2024. | Sep 4, 2024 |
| CVE-2023-45539(opens NVD record) | High | 8.2 | 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. | Nov 28, 2023 |
| CVE-2023-40225(opens NVD record) | High | 7.2 | HAProxy through 2.0.32, 2.1.x and 2.2.x through 2.2.30, 2.3.x and 2.4.x through 2.4.23, 2.5.x and 2.6.x before 2.6.15, 2.7.x before 2.7.10, and 2.8.x before 2.8.2 forwards empty Content-Length headers, violating RFC 9110 section 8.6. In uncommon cases, an HTTP/1 server behind HAProxy may interpret the payload as an extra request. | Aug 10, 2023 |
| CVE-2023-25950(opens NVD record) | High | 7.3 | 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. | Apr 11, 2023 |
| CVE-2023-0836(opens NVD record) | High | 7.5 | An information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1. There are 5 bytes left uninitialized in the connection buffer when encoding the FCGI_BEGIN_REQUEST record. Sensitive data may be disclosed to configured FastCGI backends in an unexpected way. | Mar 29, 2023 |
| CVE-2023-0056(opens NVD record) | Medium | 6.5 | An uncontrolled resource consumption vulnerability was discovered in HAProxy which could crash the service. This issue could allow an authenticated remote attacker to run a specially crafted malicious server in an OpenShift cluster. The biggest impact is to availability. | Mar 23, 2023 |
| CVE-2023-25725(opens NVD record) | Critical | 9.1 | HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1 headers are inadvertently lost in some situations, aka "request smuggling." The HTTP header parsers in HAProxy may accept empty header field names, which could be used to truncate the list of HTTP headers and thus make some headers disappear after being parsed and processed for HTTP/1.0 and HTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headers disappear before being parsed and processed, as if they had not been sent by the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29, and 2.0.31. | Feb 14, 2023 |
| CVE-2022-0711(opens NVD record) | High | 7.5 | A flaw was found in the way HAProxy processed HTTP responses containing the "Set-Cookie2" header. This flaw could allow an attacker to send crafted HTTP response packets which lead to an infinite loop, eventually resulting in a denial of service condition. The highest threat from this vulnerability is availability. | Mar 2, 2022 |
34 CVEs · 1 product families