CVE-2026-87766

EUVD-2026-74778
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.
Link Following
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 3.65%
Debian logo
Debian Releases
Debian Product
Codename
bubblewrap
bookworm
ignored
bookworm (security)
vulnerable
bullseye
ignored
forky
0.12.0-1
fixed
sid
0.12.0-1
fixed
trixie
vulnerable
trixie (security)
0.12.0-1~deb13u1
fixed
Common Weakness Enumeration
References
https://access.redhat.com/security/cve/CVE-2026-87766
https://bugs.debian.org/1145655
https://bugzilla.redhat.com/show_bug.cgi?id=2530542
https://github.com/containers/bubblewrap/releases/tag/v0.12.0
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
https://www.openwall.com/lists/oss-security/2026/08/27/7
http://www.openwall.com/lists/oss-security/2026/09/09/3