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CVE-2026-32239

Published: Mar 12, 2026

Modified: Mar 13, 2026

PUBLISHED

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.

Vendor	Product	Versions
capnproto	capnproto	affected `< 1.4.0`

Weaknesses (CWE)

References

https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm

x_refsource_CONFIRM

https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36

x_refsource_MISC

https://github.com/capnproto/capnproto/commit/e929f0ba7901a6b8f4b5ba9a4db00af43288cbb0

x_refsource_MISC

https://capnproto.org/capnproto-c++-1.4.0.tar.gz

x_refsource_MISC

https://capnproto.org/capnproto-c++-win32-1.4.0.zip

x_refsource_MISC

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