CVE-2026-32240

The record

Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.

Affected packages

Related vulnerabilities

• CVE-2026-32239 Cap'n Proto is a data interchange format and capability-based RPC system. Also affects capnproto
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