Vulnerability DatabaseCVE-2026-32239
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CVE-2026-32239
March 12, 2026
Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, a negative Content-Length value was converted to unsigned, treating it as an impossibly large length instead. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.
Affected Packages
https://github.com/capnproto/capnproto.git (GITHUB):
Affected version(s) >=v0.1.0 <v1.4.0
Fix Suggestion:
Update to version v1.4.0
Related Resources (5)
https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0
https://capnproto.org/capnproto-c++-win32-1.4.0.zip
https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm
https://capnproto.org/capnproto-c++-1.4.0.tar.gz
https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-444
Integer Overflow or Wraparound
CWE-190
EPSS
Base Score:
0.04