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CVE-2026-33555

Medium priority
Needs evaluation

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...

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-26081

Medium priority
Fixed

crash via INITIAL packet for the NEW_TOKEN format

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Not affected Not affected Not affected Not affected
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CVE-2026-26080

Medium priority
Not affected

crash in parsing frame type

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Not affected Not affected Not affected Not affected
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CVE-2025-11230

Medium priority
Fixed

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

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Fixed Fixed Not affected Not affected
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CVE-2025-8671

Medium priority

Some fixes available 2 of 23

A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to...

5 affected packages

h2o, haproxy, lighttpd, varnish, dnsdist

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
h2o Needs evaluation Needs evaluation Needs evaluation Needs evaluation
haproxy Not affected Not affected Not affected Not affected
lighttpd Needs evaluation Needs evaluation Needs evaluation Needs evaluation
varnish Needs evaluation Needs evaluation Needs evaluation Needs evaluation
dnsdist Fixed Not affected Not affected Not affected
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CVE-2025-32464

Medium priority
Fixed

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 patterns with a longer one.

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Fixed Fixed Not affected Not affected
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CVE-2024-53008

Medium priority
Fixed

Inconsistent interpretation of HTTP requests ('HTTP Request/Response Smuggling') issue exists in HAProxy. If this vulnerability is exploited, a remote attacker may access a path that is restricted by ACL (Access Control List) set...

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Fixed Not affected Not affected Not affected
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CVE-2024-49214

Medium priority
Not affected

QUIC in HAProxy 3.1.x before 3.1-dev7, 3.0.x before 3.0.5, and 2.9.x before 2.9.11 allows opening a 0-RTT session with a spoofed IP address. This can bypass the IP allow/block list functionality.

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Not affected Not affected Not affected Not affected
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CVE-2024-45506

Medium priority
Not affected

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.

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Not affected Not affected Not affected Not affected
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CVE-2023-45539

Medium priority
Fixed

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...

1 affected package

haproxy

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
haproxy Not affected Fixed Fixed Fixed
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