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Vulnerability · Published Sep 9, 2026 · Assigned by redhat

CVE-2026-87766Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

High 8.8

In plain English

A high-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.2%top 88.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10bubblewrap0.10.0-5.el10_2ALSA-2026:85308
AlmaLinux:8bubblewrap0.4.0-3.el8_10ALSA-2026:85306
AlmaLinux:9bubblewrap0.6.3-1.el9_8.1ALSA-2026:85309
Debian:12bubblewrapno fix listedDEBIAN-CVE-2026-87766
Debian:13bubblewrap0.12.0-1~deb13u1DEBIAN-CVE-2026-87766
Debian:14bubblewrap0.12.0-1DEBIAN-CVE-2026-87766
Rocky Linux:10bubblewrap0:0.10.0-5.el10_2RLSA-2026:85308
Rocky Linux:8bubblewrap0:0.4.0-3.el8_10RLSA-2026:85306
Rocky Linux:9bubblewrap0:0.6.3-1.el9_8.1RLSA-2026:85309
Ubuntu:22.04:LTSbubblewrapno fix listedUBUNTU-CVE-2026-87766
Ubuntu:22.04:LTSbubblewrap0.6.1-1ubuntu0.2USN-8779-1
Ubuntu:24.04:LTSbubblewrap0.9.0-1ubuntu0.2USN-8779-1
Ubuntu:24.04:LTSbubblewrapno fix listedUBUNTU-CVE-2026-87766
Ubuntu:26.04:LTSbubblewrap0.11.1-1ubuntu0.2USN-8779-1
Ubuntu:26.04:LTSbubblewrapno fix listedUBUNTU-CVE-2026-87766

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Hardened Images see references

Weakness: CWE-59 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References