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Vulnerability record · CVE-2020-5291 · published 31 March 2020

CVE-2020-5291: Projectatomic bubblewrap improper privilege management vulnerability

Projectatomic · Bubblewrap

Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap --userns2` option can be used to make the setuid process keep running as root while being traceable. This can in turn be used to gain root permissions. Note that this only affects the combination of bubblewrap in setuid mode (which is typically used when unprivileged user namespaces are not supported) and the support of unprivileged user namespaces. Known to be affected are: * Debian testing/unstable, if unprivileged user namespaces enabled (not default) * Debian buster-backports, if unprivileged user namespaces enabled (not default) * Arch if using `linux-hardened`, if unprivileged user namespaces enabled (not default) * Centos 7 flatpak COPR, if unprivileged user namespaces enabled (not default) This has been fixed in the 0.4.1 release, and all affected users should update.

7.8 CVSS 3.1 High EPSS 0.90% · top 41.8% CWE-648 · CWE-648CWE-269 · Improper privilege management
7.8CVSS 3.1 base score, v2 8.5
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user namespaces, then the `bwrap --userns2` option can be used to make the setuid process keep running as root while being traceable. This can in turn be used to gain root permissions. Note that this only affects the combination of bubblewrap in setuid mode (which is typically used when unprivileged user namespaces are not supported) and the support of unprivileged user namespaces. Known to be affected are: * Debian testing/unstable, if unprivileged user namespaces enabled (not default) * Debian buster-backports, if unprivileged user namespaces enabled (not default) * Arch if using `linux-hardened`, if unprivileged user namespaces enabled (not default) * Centos 7 flatpak COPR, if unprivileged user namespaces enabled (not default) This has been fixed in the 0.4.1 release, and all affected users should update.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240 PatchThird Party Advisory
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj MitigationThird Party Advisory
https://github.com/containers/bubblewrap/commit/1f7e2ad948c051054b683461885a0215f1806240 PatchThird Party Advisory
https://github.com/containers/bubblewrap/security/advisories/GHSA-j2qp-rvxj-43vj MitigationThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-5291), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.