CVE-2026-32239

Cap’n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.

More information : https://capnproto.org/capnproto-c++-1.4.0.tar.gz