Medium severity6.5NVD Advisory· Published Mar 12, 2026· Updated Jun 17, 2026
CVE-2026-32240
CVE-2026-32240
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 products
4Patches
Vulnerability mechanics
References
5- github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36nvdPatch
- github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0nvdPatch
- github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wmnvdVendor Advisory
- capnproto.org/capnproto-c++-1.4.0.tar.gznvdProduct
- capnproto.org/capnproto-c++-win32-1.4.0.zipnvdProduct
News mentions
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