CVE-2026-33555
Medium · 4.0CVSS
4.0
EPSS
0.6%
Published
Apr 13, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| openSUSE:Leap 16.0 | haproxy | 0 | 3.2.15+git64.0fc44b458-160000.2.1 |
| openSUSE:Tumbleweed | haproxy | 0 | 3.3.6+git91.af5637e93-1.1 |
Related vulnerabilities
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- CVE-2026-26080 HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash… Also affects haproxy
- CVE-2025-11230 Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a… Also affects haproxy
- CVE-2026-55204 HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference… Also affects haproxy
- CVE-2026-55203 HAProxy through 3.4.0, fixed in commit 5985276, contains an integer overflow… Also affects haproxy
- CVE-2024-49214 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… Also affects haproxy
- 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… Also affects haproxy
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