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I. Basic Information for CVE-2026-32240
Vulnerability Information

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Vulnerability Title
Cap'n Proto: Integer overflow in KJ-HTTP chunk size
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
数值截断错误
Source: NVD (National Vulnerability Database)
Vulnerability Title
capnproto 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
capnproto是capnproto开源的一个 Proto 序列化/RPC 系统-核心工具和C++库 capnproto 1.4.0之前版本存在环境问题漏洞,该漏洞源于使用分块传输编码时,块大小解析值过大被截断为64位整数,可能导致HTTP请求或响应夹带。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
capnprotocapnproto < 1.4.0 -
II. Public POCs for CVE-2026-32240
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III. Intelligence Information for CVE-2026-32240
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IV. Related Vulnerabilities
V. Comments for CVE-2026-32240

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