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VULNERABILITIES

CVE-2026-32240 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://capnproto.org/capnproto-c++-1.4.0.tar.gz [email protected]Product
https://capnproto.org/capnproto-c++-win32-1.4.0.zip [email protected]Product
https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36 [email protected]Patch
https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0 [email protected]Patch
https://github.com/capnproto/capnproto/security/advisories/GHSA-vpcq-mx5v-32wm [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-197Numeric Truncation Error[email protected]
CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')[email protected]

Affected Products

ProductVersions
capnproto capnproto
< 1.4.0

CPE

  • cpe:2.3:a:capnproto:capnproto:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-32240
NVD Published Date:
Mar 12, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-32240 Details - Not Deferred