# CVE-2026-15791: LLB file operation can be tricked to remove /tmp directory contents

> CVE-2026-15791: LLB file operation can be tricked to remove /tmp directory contents. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-15791
Last updated: 2026-10-24T19:10:00Z

- Published: 2026-07-21 16:10 UTC · Updated: 2026-10-24 19:10 UTC · Assigner: Docker
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS: 0.25%, 16th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-22

## Description

A crafted message in the BuildKit low-level build API can be used to remove the contents of the /tmp directory. The action that can normally be used to delete files inside the build container rootfs can escape into the real host temp directory.

## Affected vendors and products

- moby: BuildKit

## Tracked companies

- [Docker](https://rewindex.com/company/docker.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-15791)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-15791)
- [https://github.com/moby/buildkit/security/advisories/GHSA-32pv-7hq5-qhwq](https://github.com/moby/buildkit/security/advisories/GHSA-32pv-7hq5-qhwq)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-15791 · Markdown: https://rewindex.com/cve/CVE-2026-15791.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-15791 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:45.087Z