CVE-2026-32239

Name	CVE-2026-32239
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
capnproto (PTS)	bullseye	0.7.0-7	vulnerable
	bookworm	0.9.2-2	vulnerable
	trixie	1.1.0-2	vulnerable
	forky, sid	1.1.0-2.1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
capnproto	source	(unstable)	(unfixed)

Notes

https://github.com/capnproto/capnproto/security/advisories/GHSA-qjx3-pp3m-9jpm
Fixed by: https://github.com/capnproto/capnproto/commit/2744b3c012b4aa3c31cefb61ec656829fa5c0e36 (v1.4.0)