CVE-2026-32240
Cap'n Proto: Integer overflow in KJ-HTTP chunk size
Summary
Cap'n Proto: Integer overflow in KJ-HTTP chunk size
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-32240 capnproto
- Ubuntu UBUNTU-CVE-2026-32240 capnproto
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com
- web capnproto.org
- web capnproto.org