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Haproxy · product

Haproxy

32 CVEs

Every dot is a CVE in what this vendor ships; the named ones are the most at risk.

likely to be exploited
5

Every one of the 32 is a mark on the map. Named now: 1 to 26, most at risk first.

  1. 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.CVE-2019-14241Haproxy · 70% likely

    CWE-835

  2. 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…CVE-2020-11100Haproxy · 62% likely

    CWE-787

  3. 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 confi…CVE-2021-40346Haproxy · 59% likely

    CWE-190

  4. 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 lea…CVE-2022-0711Haproxy · 17% likely

    CWE-835

  5. 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 correctly rejected. The impact w…CVE-2019-18277Haproxy · 10% likely

    CWE-444

  6. An issue was discovered in HAProxy before 1.8.8. The incoming H2 frame length was checked against the max_frame_size setting instead of being checked against the bufsize. The max_…CVE-2018-10184Haproxy · 8.1% likely

    CWE-119

  7. An issue was discovered in dns.c in HAProxy through 1.8.14. In the case of a compressed pointer, a crafted packet can trigger infinite recursion by making the pointer point to its…CVE-2018-20103Haproxy · 6.6% likely

    CWE-835

  8. 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 HAP…CVE-2023-25725Haproxy · CVSS 9.1 · 5.5% likely

    CWE-444

  9. 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. The processing of the PRIORITY flag…CVE-2018-20615Haproxy · 4.5% likely

    CWE-125

  10. An out-of-bounds read in dns_validate_dns_response in dns.c was discovered in HAProxy through 1.8.14. Due to a missing check when validating DNS responses, remote attackers might…CVE-2018-20102Haproxy · 4.2% likely

    CWE-125

  11. 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,…CVE-2019-19330Haproxy · 4.0% likely

    CWE-74

  12. A flaw was discovered in the HPACK decoder of HAProxy, before 1.8.14, that is used for HTTP/2. An out-of-bounds read access in hpack_valid_idx() resulted in a remote crash and den…CVE-2018-14645Haproxy · CVSS 7.5 · 3.1% likely

    CWE-125

  13. 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…CVE-2023-25950HAProxy Technologies · CVSS 7.3 · 3.0% likely

    CWE-444

  14. Incorrect caching of responses to requests including an Authorization header in HAProxy 1.8.0 through 1.8.9 (if cache enabled) allows attackers to achieve information disclosure v…CVE-2018-11469Haproxy · 2.9% likely

    CWE-200

  15. An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It can lead to a situation with an attacker-controlled HTTP Host header, because a m…CVE-2021-39242Haproxy · 2.2% likely

    CWE-755

  16. An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected char…CVE-2021-39240Haproxy · 2.2% likely
  17. 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 C…CVE-2023-40225Haproxy · 2.1% likely

    CWE-444

  18. 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 specia…CVE-2023-0056Haproxy · CVSS 6.5 · 1.8% likely

    CWE-400

  19. An issue was discovered in HAProxy 2.0 before 2.0.24, 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. An HTTP method name may contain a space followed by the name of a…CVE-2021-39241Haproxy · 1.7% likely
  20. 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 misinterpreta…CVE-2023-45539Haproxy · CVSS 8.2 · 1.5% likely

    CWE-116

  21. 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 an include/types/ssl_sock.h er…CVE-2019-11323Haproxy · 1.3% likely

    CWE-327

  22. 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…CVE-2024-45506Haproxy · CVSS 7.5 · 1.2% likely

    CWE-835

  23. 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 byte…CVE-2023-0836Haproxy · CVSS 7.5 · 1.2% likely

    CWE-200

  24. 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. Although th…CVE-2026-110354HAProxy · CVSS 7.5 · 0.8% likely

    CWE-835

  25. HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer overflow because of mishandling of the replacement of multiple short patt…CVE-2025-32464HAProxy · CVSS 6.8 · 0.8% likely

    CWE-1025

  26. An issue was discovered in HAProxy 3.3.0 through 3.4.4 and in 3.5-dev1 through 3.5-dev5. Exploitation requires an HTTP/3 frontend: HAProxy must be built with QUIC support and conf…CVE-2026-90678HAProxy · CVSS 7.5 · 0.8% likely

    CWE-130

exploited in the wildcheck availableringed, named or not: CyberSIXT has reported on it

Zoom in on the map and the dots under the middle of it are named where they are.

Data as of 2026-11-14. CVE List through 2026-11-14 · EPSS of 2026-11-13 · CISA KEV checked 2026-11-14. Sources: the CVE List, CISA KEV, EPSS, NVD, nuclei templates and public bug bounty data.

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