CVE-2026-32239

MediumCVSS 6.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-190 CWE-444

Affected software

No affected versions have been published.

Timeline

Published: Mar 12, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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