Vulnerability index

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Haproxy CRITICAL 9.1
CVE-2026-55203

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 …

Fix: after 3.4.0
Fix from $2,300 2026-06-18
Haproxy HIGH 7.5
CVE-2026-55204

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 …

Fix: after 3.4.0
Fix from $1,950 2026-06-18
Haproxy MEDIUM 5.8
CVE-2026-33555

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 conten…

Fix: 3.3.6+
Fix from $1,600 2026-04-13
Aloha Appliance HIGH 7.5
CVE-2025-11230

Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.

Fix: 1.9.14-ee7 / 1.11.12-ee10+
Fix from $1,950 2025-11-19
Haproxy HIGH 7.5
CVE-2024-45506

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_sen…

Fix: 2.9.10 / 3.0.4+
Fix from $1,950 2024-09-04
Haproxy HIGH 8.2
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 unspecified o…

Fix: 2.8.2+
Fix from $1,950 2023-11-28
Haproxy HIGH 7.2
CVE-2023-40225

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…

Fix: 2.6.15 / 2.7.10+
Fix from $1,950 2023-08-10
Haproxy HIGH 7.3
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 user's requ…

Fix: after 2.6.7
Fix from $1,950 2023-04-11
Haproxy HIGH 7.5
CVE-2023-0836

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 …

Fix: 2.2.27+
Fix from $1,950 2023-03-29
Haproxy HIGH 7.5
CVE-2019-18277EPSS 10%

A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being co…

Fix: 2.0.6+
Fix from $1,950 2019-10-23
Proxyprotocol HIGH 7.5
CVE-2019-14243

headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows re…

Fix: 0.0.2+
Fix from $1,950 2019-07-23
Haproxy HIGH 7.5
CVE-2019-14241EPSS 70%

HAProxy through 2.0.2 allows attackers to cause a denial of service (ha_panic) via vectors related to htx_manage_client_side_cookies in proto_htx.c.

Fix: after 2.0.2
Fix from $1,950 2019-07-23
Haproxy MEDIUM 5.9
CVE-2019-11323

HAProxy before 1.9.7 mishandles a reload with rotated keys, which triggers use of uninitialized, and very predictable, HMAC keys. This is related to …

Fix: 1.9.7+
Fix from $1,600 2019-05-09
Haproxy MEDIUM 5.3
CVE-2016-2102

HAProxy statistics in openstack-tripleo-image-elements are non-authenticated over the network.

No fix yet
Fix from $1,600 2017-08-22
Haproxy MEDIUM 5.0
CVE-2014-6269

Multiple integer overflows in the http_request_forward_body function in proto_http.c in HAProxy 1.5-dev23 before 1.5.4 allow remote attackers to caus…

No fix yet
Fix from $1,600 2014-09-30
Haproxy MEDIUM 5.1
CVE-2013-1912EPSS 5%

Buffer overflow in HAProxy 1.4 through 1.4.22 and 1.5-dev through 1.5-dev17, when HTTP keep-alive is enabled, using HTTP keywords in TCP inspection r…

Mitigation only
Fix from $1,600 2013-04-10
Haproxy MEDIUM 5.1
CVE-2012-2942EPSS 5%

Buffer overflow in the trash buffer in the header capture functionality in HAProxy before 1.4.21, when global.tune.bufsize is set to a value greater …

Fix: after 1.4.20
Fix from $1,600 2012-05-27