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CVE-2026-32240

MEDIUM CVSS: 6.5 Published: 2026-03-12 Modified: 2026-06-17

Description

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 Platforms

Capnproto Capnproto

Weakness Type

CWE-197, CWE-444

References