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CVE-2026-87766

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

HIGH
8.8
CVSS Score
Published: September 9, 2026 at 08:34 AM UTC
Updated: October 20, 2026 at 12:19 AM UTC
2 products affected across 1 vendorHardened ImagesEnterprise Linux

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Severity
HIGH8.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Hardened Images· Red Hatcontainer
90%
All versions
Vendor states this is fixed in 1 (unaffected)
Enterprise Linux· Red Hatrpm
60%
10
Vendor states this is fixed in 0:0.10.0-3.el10_0.4 (unaffected)
Vendor states this is fixed in 0:0.10.0-5.el10_2 (unaffected)
Vendor states this is fixed in 0:0.4.0-3.el8_10 (unaffected)
Vendor states this is fixed in 0:0.4.0-3.el8_4 (unaffected)
Vendor states this is fixed in 0:0.4.0-3.el8_6 (unaffected)
Vendor states this is fixed in 0:0.4.0-3.el8_8 (unaffected)
Vendor states this is fixed in 0:0.4.1-7.el9_2.1 (unaffected)
Vendor states this is fixed in 0:0.4.1-7.el9_4.1 (unaffected)
Vendor states this is fixed in 0:0.4.1-8.el9_6.1 (unaffected)
Vendor states this is fixed in 0:0.6.3-1.el9_8.1 (unaffected)

References (18)

VDB Entryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-87766
Source: cverecord
https://bugs.debian.org/1145655
Issue Trackingx_refsource_REDHAT
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2530542
Source: cverecord
https://github.com/containers/bubblewrap/releases/tag/v0.12.0
Source: cverecord
https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx
Source: cverecord
https://www.openwall.com/lists/oss-security/2026/08/27/7
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/09/09/3
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/09/22/23

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-59

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