CVE-2026-33555
MEDIUM
NVD
CVSS Score
4
Severity
MEDIUM
Published
Apr 13, 2026
Vendor
unknown
Description
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.