What’s Vulnerable › Vulnerabilities

CVE-2020-27534

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-30 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• Docker Engine: before 19.03.9 — fixed in 19.03.9

How to fix

Upgrade to a fixed version: Docker Engine 19.03.9. Check the vendor advisory for mitigations.

References

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

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