CVE-2019-12439: bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point

Q: How do I fix CVE-2019-12439?

bubblewrap: upgrade to 0.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2019-12439 being exploited?

CVE-2019-12439 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-12439 affect?

CVE-2019-12439 affects bubblewrap. Severity is high (CVSS 7.4). bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point. In some particular configurations (related to XDG_RUNTIME_DIR), a local attacker may abuse this flaw to prevent other users from executing bubbl

Routine

HIGH 7.4UPGRADE

CVE-2019-12439 is a high-severity flaw (CVSS 7.4) affecting bubblewrap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point. In some particular configurations (related to XDG_RUNTIME_DIR), a local attacker may abuse this flaw to prevent other users from executing bubblewrap or potentially execute code.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-20
Published	2019-05-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: projectatomic

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-05-29 15:29 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

projectatomic bubblewrap UPGRADE

Affected: < 0.3.3

Fixed in: 0.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bubblewrap || rpm -q bubblewrap || bubblewrap --version

2. UPGRADE to 0.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bubblewrap

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bubblewrap

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-12439?

bubblewrap: upgrade to 0.3.3. Exact commands for each OS are on this page.

Is CVE-2019-12439 being exploited?

CVE-2019-12439 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-12439 affect?

CVE-2019-12439 affects bubblewrap. Severity is high (CVSS 7.4). bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount point. In some particular configurations (related to XDG_RUNTIME_DIR), a local attacker may abuse this flaw to prevent other users from executing bubbl

How urgent is CVE-2019-12439?

Priority 38/100. High severity

Related CVEs

CVE-2020-5291 HIGH 7.2 UPGRADE MITIGATE Bubblewrap (bwrap) before version 0.4.1, if installed in setuid mode and the kernel supports unprivileged user
CVE-2017-5226 CRITICAL 10.0 UPGRADE When executing a program via the bubblewrap sandbox, the nonpriv session can escape to the parent session by u
CVE-2016-8659 HIGH 7.0 UPGRADE Bubblewrap before 0.1.3 sets the PR_SET_DUMPABLE flag, which might allow local users to gain privileges by att

References

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