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.
Problem types
CWE-130 Improper Handling of Length Parameter Inconsistency
Product status
2.6 (custom) before 3.3.6
References
r3verii.github.io/...aproxy-h3-standalone-fin-smuggling.html
www.haproxy.com/documentation/haproxy-aloha/changelog/
github.com/...ommit/05a295441c621089ffa4318daf0dbca2dd756a84
www.mail-archive.com/haproxy@formilux.org/msg46752.html
r3verii.github.io/...aproxy-h3-standalone-fin-smuggling.html