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CVE-2026-32239

6.5 · MEDIUM

Cap'n Proto is a data interchange format and capability-based RPC system.

Published Mar 12, 2026CWE-190EPSS 0.21%

Overview

CVE-2026-32239 is a medium-severity vulnerability. It was published on March 12, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcapnproto.org/capnproto-c++-1.4.0.tar.gzRefcapnproto.org/capnproto-c++-win32-1.4.0.zipGitHubgithub.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36GitHubgithub.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0GitHubgithub.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm

How CyberStrike helps

Frequently asked questions

What is CVE-2026-32239?

CVE-2026-32239 is a medium-severity vulnerability. It was published on March 12, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-32239?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-32239?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-32239?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-32239 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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