Priority HIGH 73
In hpack_dht_insert in hpack-tbl.c in the HPACK decoder in HAProxy 1.8 through 2.x before 2.1.4, a remote attacker can write arbitrary bytes around a certain location on the heap via a crafted HTTP/2 request, possibly ca…
CVSS 3.1HIGH 8.8· Network · Low privileges · No interaction · EPSS 0.61593 · Published 2020-04-02 · Fixed CWE-787
Priority HIGH 71
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…
CVSS 3.1HIGH 7.2· Network · No auth · No interaction · EPSS 0.02147 · Published 2023-08-10 · Partial fix CWE-444
Priority HIGH 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.
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.7024 · Published 2019-07-23 · No fix listed CWE-835
Priority HIGH 67
An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possi…
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.58832 · Published 2021-09-08 · Partial fix CWE-190
Priority MEDIUM 61
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 vector…
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.4282 · Published 2016-06-30 · No fix listed CWE-119
Priority MEDIUM 59
An issue was discovered in HAProxy before 3.3.6.
CVSS 3.1MEDIUM 5.8· Network · No auth · No interaction · EPSS 0.00307 · Published 2026-04-13 · Partial fix · 3.3.6 CWE-130
Priority MEDIUM 54
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,…
CVSS 3.1CRITICAL 9.1· Network · No auth · No interaction · EPSS 0.05493 · Published 2023-02-14 · Partial fix CWE-444
Priority MEDIUM 50
A flaw was found in the way HAProxy processed HTTP responses containing the "Set-Cookie2" header.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.16563 · Published 2022-03-02 · Fixed CWE-835
Priority MEDIUM 49
In HAProxy Data Plane API 2.2.0 through 3.4.3 (and corresponding Enterprise Edition releases), Server.ConfigureAPI() has process-global authentication logic that improperly drops security controls across multiple transpo…
CVSS 3.1CRITICAL 9.8· Network · No auth · No interaction · EPSS 0.00355 · Published 2026-10-12 · No fix listed CWE-306
Priority MEDIUM 49
The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulatio…
CVSS 3.1CRITICAL 9.8· Network · No auth · No interaction · EPSS 0.04032 · Published 2019-11-27 · Fixed CWE-74
Priority MEDIUM 45
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…
CVSS 3.1HIGH 8.2· Network · No auth · No interaction · EPSS 0.01514 · Published 2023-11-28 · Partial fix CWE-116
Priority MEDIUM 45
A flaw was found in HAProxy before 2.0.6.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.10068 · Published 2019-10-23 · Partial fix CWE-444
Priority MEDIUM 44
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…
CVSS 4.0HIGH 8.7· Network · No auth · No interaction · EPSS 0.00484 · Published 2026-06-18 · Partial fix CWE-476
Priority MEDIUM 44
An issue was discovered in HAProxy before 1.8.8.
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.08149 · Published 2018-05-09 · Fixed CWE-119
Priority MEDIUM 43
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.
CVSS 3.1HIGH 7.3· Network · No auth · No interaction · EPSS 0.02966 · Published 2023-04-11 · Will not fix CWE-444
Priority MEDIUM 42
An issue was discovered in dns.c in HAProxy through 1.8.14.
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.06593 · Published 2018-12-12 · Partial fix CWE-835
Priority MEDIUM 41
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…
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.01203 · Published 2024-09-04 · No fix listed CWE-835
Priority MEDIUM 41
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.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.01201 · Published 2023-03-29 · Partial fix CWE-200
Priority MEDIUM 40
HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.00807 · Published 2026-10-22 · Partial fix · 3.0.30, 3.2.26 +10 CWE-835
Priority MEDIUM 40
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.00738 · Published 2026-10-22 · Partial fix · 3.2.26, 3.3.17 +8 CWE-252
Priority MEDIUM 40
Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.0074 · Published 2025-11-19 · Partial fix · 2.4.30, 2.6.23 +4 CWE-407
Priority MEDIUM 40
headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon…
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.04295 · Published 2019-07-23 · Fixed in 0.0.2 CWE-20
Priority MEDIUM 40
An out-of-bounds read issue was discovered in the HTTP/2 protocol decoder in HAProxy 1.8.x and 1.9.x through 1.9.0 which can result in a crash.
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.04459 · Published 2019-03-18 · Partial fix CWE-125
Priority MEDIUM 40
An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14.
CVSS 3.0HIGH 7.5· Network · No auth · No interaction · EPSS 0.0415 · Published 2018-12-12 · Partial fix CWE-125
Priority LOW 39
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.
CVSS 4.0CRITICAL 9.0· Network · No auth · No interaction · EPSS 0.00334 · Published 2026-06-18 · Partial fix CWE-190
Load more