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Vulnerability Details CVE-2026-32240

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 13.3%

CVSS Severity

CVSS v3 Score 6.5

References

Products affected by CVE-2026-32240

Capnproto » Capnproto » Version: 0.1.0

cpe:2.3:a:capnproto:capnproto:0.1.0
Capnproto » Capnproto » Version: 0.10.0

cpe:2.3:a:capnproto:capnproto:0.10.0
Capnproto » Capnproto » Version: 0.10.1

cpe:2.3:a:capnproto:capnproto:0.10.1
Capnproto » Capnproto » Version: 0.10.2

cpe:2.3:a:capnproto:capnproto:0.10.2
Capnproto » Capnproto » Version: 0.10.3

cpe:2.3:a:capnproto:capnproto:0.10.3
Capnproto » Capnproto » Version: 0.10.4

cpe:2.3:a:capnproto:capnproto:0.10.4
Capnproto » Capnproto » Version: 0.2.0

cpe:2.3:a:capnproto:capnproto:0.2.0
Capnproto » Capnproto » Version: 0.2.1

cpe:2.3:a:capnproto:capnproto:0.2.1
Capnproto » Capnproto » Version: 0.3.0

cpe:2.3:a:capnproto:capnproto:0.3.0
Capnproto » Capnproto » Version: 0.4.0

cpe:2.3:a:capnproto:capnproto:0.4.0
Capnproto » Capnproto » Version: 0.4.1

cpe:2.3:a:capnproto:capnproto:0.4.1
Capnproto » Capnproto » Version: 0.4.1.1

cpe:2.3:a:capnproto:capnproto:0.4.1.1
Capnproto » Capnproto » Version: 0.4.1.2

cpe:2.3:a:capnproto:capnproto:0.4.1.2
Capnproto » Capnproto » Version: 0.5.0

cpe:2.3:a:capnproto:capnproto:0.5.0
Capnproto » Capnproto » Version: 0.5.1

cpe:2.3:a:capnproto:capnproto:0.5.1
Capnproto » Capnproto » Version: 0.5.1.1

cpe:2.3:a:capnproto:capnproto:0.5.1.1
Capnproto » Capnproto » Version: 0.5.1.2

cpe:2.3:a:capnproto:capnproto:0.5.1.2
Capnproto » Capnproto » Version: 0.5.2

cpe:2.3:a:capnproto:capnproto:0.5.2
Capnproto » Capnproto » Version: 0.5.3

cpe:2.3:a:capnproto:capnproto:0.5.3
Capnproto » Capnproto » Version: 0.5.3.1

cpe:2.3:a:capnproto:capnproto:0.5.3.1
Capnproto » Capnproto » Version: 0.5.4

cpe:2.3:a:capnproto:capnproto:0.5.4
Capnproto » Capnproto » Version: 0.6.0

cpe:2.3:a:capnproto:capnproto:0.6.0
Capnproto » Capnproto » Version: 0.6.1

cpe:2.3:a:capnproto:capnproto:0.6.1
Capnproto » Capnproto » Version: 0.7.0

cpe:2.3:a:capnproto:capnproto:0.7.0
Capnproto » Capnproto » Version: 0.7.1

cpe:2.3:a:capnproto:capnproto:0.7.1
Capnproto » Capnproto » Version: 0.8.0

cpe:2.3:a:capnproto:capnproto:0.8.0
Capnproto » Capnproto » Version: 0.8.1

cpe:2.3:a:capnproto:capnproto:0.8.1
Capnproto » Capnproto » Version: 0.9.0

cpe:2.3:a:capnproto:capnproto:0.9.0
Capnproto » Capnproto » Version: 0.9.1

cpe:2.3:a:capnproto:capnproto:0.9.1
Capnproto » Capnproto » Version: 0.9.2

cpe:2.3:a:capnproto:capnproto:0.9.2
Capnproto » Capnproto » Version: 1.0.0

cpe:2.3:a:capnproto:capnproto:1.0.0
Capnproto » Capnproto » Version: 1.0.1

cpe:2.3:a:capnproto:capnproto:1.0.1
Capnproto » Capnproto » Version: 1.0.1.1

cpe:2.3:a:capnproto:capnproto:1.0.1.1

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-32240

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