CVE-2026-87766

Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

State: Published
Severity: 8.8 High
Published: Sep 9, 2026
Updated: Oct 19, 2026
Reserved: Sep 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	redhat

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:0.10.0-5.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:0.10.0-3.el10_0.4 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:0.4.0-3.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:0.4.0-3.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:0.4.0-3.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:0.4.0-3.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:0.4.0-3.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:0.4.0-3.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:0.4.0-3.el8_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:0.6.3-1.el9_8.1 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:0.4.1-7.el9_2.1 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:0.4.1-7.el9_4.1 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:0.4.1-8.el9_6.1 and laterNot affected
Red Hat Hardened ImagesRed Hat

References

RHSA-2026:85306vendor-advisory
RHSA-2026:85308vendor-advisory
RHSA-2026:85309vendor-advisory
RHSA-2026:85312vendor-advisory
RHSA-2026:85313vendor-advisory
RHSA-2026:85317vendor-advisory
RHSA-2026:85319vendor-advisory
RHSA-2026:85322vendor-advisory
RHSA-2026:85324vendor-advisory
RHSA-2026:85325vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-87766vdb-entry
https://bugs.debian.org/1145655
RHBZ#2530542issue-tracking
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
http://www.openwall.com/lists/oss-security/2026/09/22/23

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