bubblewrap.c in Bubblewrap before 0.3.3 misuses temporary directories in /tmp as a mount…
Priority LOW 35CWE-20Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 1 fixed, 2 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
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 it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00575 47th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:projectatomic:bubblewrap:*:*:*:*:*:*:*:* | before 0.3.3 | Vulnerable | Project Atomic |
- cpe:2.3:a:projectatomic:bubblewrap:*:*:*:*:*:*:*:* Versions before 0.3.3 Vulnerable ·Project Atomic
Remediation
Red Hat 1 advisory
- RHSA-2019:1833 Released 2019-07-24 · Red Hat rating LowCloudForms 4.7.7 security, bug fix and enhancement update
- CloudForms Management Engine 5.10 ansible-runner-1.3.4-2.el7ar, ansible-tower-3.5.0-1.el7at, ansible-tower-server-3.5.0-1.el7at +16
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Tower 3 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| CloudForms Management Engine 5.10 | Fixed | RHSA-2019:1833 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-12439
- 2026-10-03 Alias added: GHSA-hj8h-43q8-g8vp
- 2026-11-02 CISA SSVC decision points changed
References
More Project Atomic Bubblewrap vulnerabilities
- TI-2017-03337 When executing a program via the bubblewrap sandbox, the nonpriv session can escape to… CVSS 3.0CRITICAL 10.0
- TI-2020-04347 Privilege escalation in setuid mode via user namespaces in Bubblewrap CVSS 3.1HIGH 7.8
Sources
- CVE-2019-12439 · CVE Program
- CVE-2019-12439 · NVD
- FIRST EPSS
- GHSA-hj8h-43q8-g8vp · GitHub Advisory Database · CC BY 4.0
- CVE-2019-12439 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences