CVE-2026-87766

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

HIGH 8.8

At a glance

Source: NVD
EPSS: EPSS 0.21 % · percentile 11 (2026-10-28)
State: PUBLISHED
Published: 2026-09-09 08:34 UTC
Updated: 2026-10-19 23:12 UTC
Assigner: redhat
NVD status: Awaiting Analysis

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.

Weaknesses (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	redhat
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	NVD · secalert@redhat.com (Secondary)

European references

ENISA EUVD · EUVD-2026-74778
GCVE · GCVE-0-2026-87766

Affected products

Product	Versions
Red Hat · Red Hat Enterprise Linux 10	unaffected 0:0.10.0-5.el10_2 < *
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support	unaffected 0:0.10.0-3.el10_0.4 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:0.4.0-3.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:0.4.0-3.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	unaffected 0:0.4.0-3.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	unaffected 0:0.4.0-3.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	unaffected 0:0.4.0-3.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:0.4.0-3.el8_8 < *
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	unaffected 0:0.4.0-3.el8_8 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:0.6.3-1.el9_8.1 < *
Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	unaffected 0:0.4.1-7.el9_2.1 < *
Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	unaffected 0:0.4.1-7.el9_4.1 < *
Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support	unaffected 0:0.4.1-8.el9_6.1 < *
Red Hat · Red Hat Hardened Images

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD