CVE-2026-87766

Name	CVE-2026-87766
Description	A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.
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)
References	DSA-6472-1
Debian Bugs	1145655

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
bubblewrap (PTS)	bookworm (security), bookworm	0.8.0-2+deb12u1	vulnerable
	trixie (security), trixie	0.12.0-1~deb13u1	fixed
	forky, sid	0.13.0-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
bubblewrap	source	trixie	0.12.0-1~deb13u1		DSA-6472-1
bubblewrap	source	(unstable)	0.12.0-1			1145655

Notes

[bookworm] - bubblewrap <ignored> (Intrusive backport due to a complete rewrite)
[bullseye] - bubblewrap <ignored> (Intrusive backport due to a complete rewrite)
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx