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CVE-2026-33555
MEDIUM(4.0)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Risk Signal Score10/100 — NIEDRIG
- CVSS 4 — Mittel
EPSS-Score
0%
Exploit-Wahrscheinlichkeit (30 Tage)
CVSS Score
4
Technische Schwere
Beschreibung
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.
Referenzen
- https://github.com/haproxy/haproxy/commit/05a295441c621089ffa4318daf0dbca2dd756a...
- https://r3verii.github.io/cve/2026/04/14/haproxy-h3-standalone-fin-smuggling.htm...
- https://www.haproxy.com/documentation/haproxy-aloha/changelog/
- https://www.haproxy.org
- https://www.mail-archive.com/haproxy@formilux.org/msg46752.html
- https://r3verii.github.io/cve/2026/04/14/haproxy-h3-standalone-fin-smuggling.htm...