CVE catalog

CVE-2020-5291

bubblewrap: CVE-2020-5291

Severity: High · CVSS 7.8CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: Mar 31, 2020, 6:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.90% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	bubblewrap	sid	`0.13.1-1`	fixed
Debian	bubblewrap	forky	`0.13.1-1`	fixed
Debian	bubblewrap	trixie	`0.12.0-1~deb13u1`	fixed
Debian	bubblewrap	trixie-security	`0.12.0-1~deb13u1`	fixed
Debian	bubblewrap	bookworm	`0.8.0-2+deb12u1`	fixed
Debian	bubblewrap	bookworm-security	`0.8.0-2+deb12u1`	fixed
Alpine	bubblewrap	3.11	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.12	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.13	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.14	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.15	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.16	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.17	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.18	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.19	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.20	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.21	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.22	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.23	`0.4.1-r0`	fixed
Alpine	bubblewrap	3.24	`0.4.1-r0`	fixed
Ubuntu	bubblewrap	20.04	`0.3.3-2`	vulnerable
Ubuntu	bubblewrap	20.04	`0.4.0-1`	vulnerable
Ubuntu	bubblewrap	20.04	`0.4.0-1ubuntu1`	vulnerable
Ubuntu	bubblewrap	20.04	`0.4.0-1ubuntu2`	vulnerable
Ubuntu	bubblewrap	20.04	`0.4.0-1ubuntu3`	vulnerable
Ubuntu	bubblewrap	20.04	`0.4.0-1ubuntu4`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	bubblewrap	source	sid	`0.4.1-1`	low	Not reported	[955441]
Debian	bubblewrap	source	forky	`0.4.1-1`	low	Not reported	[955441]
Debian	bubblewrap	source	trixie	`0.4.1-1`	low	Not reported	[955441]
Debian	bubblewrap	source	bookworm	`0.4.1-1`	low	Not reported	[955441]
Alpine	bubblewrap	apk	3.11	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.12	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.13	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.14	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.15	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.16	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.17	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.18	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.19	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.20	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.21	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.22	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.23	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Alpine	bubblewrap	apk	3.24	`0.4.1-r0`	Not reported	ALPINE-CVE-2020-5291	Not reported
Ubuntu	bubblewrap	deb	20.04	`0.4.0-1ubuntu4`	Not reported	UBUNTU-CVE-2020-5291	Not reported

[Debian bug #955441]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[bubblewrap]Unknown
Details (4)
- 0.8.0-2+deb12u1 · amd64 · bookworm
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · bookworm; dsa · bubblewrap · debian · 12
- 0.8.0-2+deb12u1 · arm64 · bookworm
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · bookworm; dsa · bubblewrap · debian · 12
- 0.8.0-2+deb12u1 · amd64 · bookworm-security
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · bookworm; dsa · bubblewrap · debian · 12
- 0.8.0-2+deb12u1 · arm64 · bookworm-security
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · bookworm; dsa · bubblewrap · debian · 12

[Debian 13 (Trixie)]

[bubblewrap]Unknown
Details (4)
- 0.11.0-2+deb13u1 · amd64 · trixie
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · 13
- 0.11.0-2+deb13u1 · arm64 · trixie
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · 13
- 0.12.0-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · 13
- 0.12.0-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 0.4.1-1
  dsa · bubblewrap · debian · 13

Observed: Oct 23, 2026, 5:52:52 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]