We don't enforce any limits for the encoded variable lengths that are used for fields. As the remote peer controls these it's easy for the remote peer to have us buffer data forever and so ultimately OOM.
io.netty.incubator:netty-incubator-codec-bhttp uses attacker-controlled Binary HTTP variable-length integers as long values but accumulates them into int offsets. Large valid varint lengths wrap the internal offset negative, leading to unchecked ArrayIndexOutOfBoundsException / IndexOutOfBoundsException from a tiny malformed BHTTP payload. A remote peer can trigger connection-level denial of service in applications that expose BinaryHttpParser / BinaryHttpDecoder to untrusted input.
io.netty.incubator:netty-incubator-codec-bhttp can enter a non-terminating parse loop when a known-length Binary HTTP field section ends exactly after a complete field line. A remote peer that can send Binary HTTP input to a Netty pipeline using BinaryHttpParser / BinaryHttpDecoder can use a tiny malformed request or response to keep the parsing thread busy indefinitely, causing denial of service.
BinaryHttpParser decodes Binary HTTP (RFC 9292) messages. An OHTTP gateway/client built on this library feeds the decrypted OHTTP body straight into BinaryHttpParser.parse(…). The field-section decoding loop terminates only on the exact condition fieldSectionLength != 0 and relies on a Java assert to guarantee forward progress. Because (a) the loop counter can be driven negative and (b) readFieldLine(…) legitimately consumes zero bytes and returns null on a truncated/over-long field line, the …
BinaryHttpParser does not properly validate input values thus giving attackers almost complete control over the HTTP requests constructed from the parsed output. Attackers can abuse several issues individually to perform various injection attacks including HTTP request smuggling, desync attacks, HTTP header injections, request queue poisoning, caching attacks and Server Side Request Forgery (SSRF). Attacker could also combine several issues to create well-formed messages for other text-based protocols which may result …