CVE-2026-33747: GO-2026-4858 - BuildKit's Malicious frontend can cause file escape outside of storage root in github.com/moby/buildkit

CVE-2026-33747 · Severity: low · CVSS 3.1 · Published 2026-03-27

BuildKit's Malicious frontend can cause file escape outside of storage root in github.com/moby/buildkit

Technologies: github.com/moby/buildkit (Go). Vendors: Go.

Quick answers

Is CVE-2026-33747 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33747 being exploited in the wild.
How severe is CVE-2026-33747?
Low severity, with a CVSS score of 3.1, published 27 March 2026.
Which products and versions are affected?
github.com/moby/buildkit (Go) SEMVER:introduced=0,fixed=0.28.1.
Is there a fix for CVE-2026-33747?
Yes. github.com/moby/buildkit (Go): upgrade to 0.28.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33747?
Check whether you run github.com/moby/buildkit (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/moby/buildkit (Go): upgrade to 0.28.1 or later
    go get github.com/moby/buildkit@v0.28.1

Affected products

  • github.com/moby/buildkit (Go) SEMVER:introduced=0,fixed=0.28.1

Identifiers

  • CVE-2026-33747
  • GHSA-4c29-8rgm-jvjj
  • GO-2026-4858

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