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Vulnerability record · CVE-2020-27534 · published 30 December 2020

CVE-2020-27534: Docker path traversal vulnerability

Docker · Docker

util/binfmt_misc/check.go in Builder in Docker Engine before 19.03.9 calls os.OpenFile with a potentially unsafe qemu-check temporary pathname, constructed with an empty first argument in an ioutil.TempDir call.

5.3 CVSS 3.1 Medium EPSS 1.8% · top 22.8% CWE-22 · Path traversal
5.3CVSS 3.1 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

util/binfmt_misc/check.go in Builder in Docker Engine before 19.03.9 calls os.OpenFile with a potentially unsafe qemu-check temporary pathname, constructed with an empty first argument in an ioutil.TempDir call.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://web.archive.org/web/20200530054359/https://docs.docker.com/engine/release-notes/ Release NotesThird Party Advisory
https://github.com/moby/buildkit/pull/1462 Third Party Advisory
https://github.com/moby/moby/pull/40877 Third Party Advisory
https://golang.org/pkg/io/ioutil/#TempDir Third Party Advisory
https://golang.org/pkg/os/#TempDir Third Party Advisory
http://web.archive.org/web/20200530054359/https://docs.docker.com/engine/release-notes/ Release NotesThird Party Advisory
https://github.com/moby/buildkit/pull/1462 Third Party Advisory
https://github.com/moby/moby/pull/40877 Third Party Advisory
https://golang.org/pkg/io/ioutil/#TempDir Third Party Advisory
https://golang.org/pkg/os/#TempDir Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-27534), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.