CVE-2026-33747
No exploitation reported by the sources we read.
- Published2026-03-27
- Fixed in0.28.1
- WeaknessCWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when using a custom BuildKit frontend, the frontend can craft an API message that causes files to be written outside of the BuildKit state directory for the execution context. The issue has been fixed in v0.28.1. The vulnerability requires using an untrusted BuildKit frontend set with `#syntax` or `--build-arg BUILDKIT_SYNTAX`. Using these options with a well-known frontend image like `docker/dockerfile` is not affected.
Timeline
dates in UTC- 2026-03-2701:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-33747?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-33747?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 0.28 | < 0.28.1 | 0.28.1 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
Red Hat Security Advisory: Red Hat Quay 3.14.9
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.20.17 security, enhancement & bug fix update
Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.8 security update
Red Hat Security Advisory: Red Hat OpenShift API for Data Protection
Red Hat Security Advisory: Red Hat OpenShift API for Data Protection
Red Hat Security Advisory: Red Hat Quay 3.17.2
4 more advisories
Fix
- Update Mobyproject buildkit to 0.28.1
- Vendor fix Red Hat Product Security RHSA-2026:70267 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11458
- Vendor fix Red Hat Product Security RHSA-2026:57013 · 88 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.20/html/updating_openshift_data_foundation/updating-ocs-…
- Vendor fix Red Hat Product Security RHSA-2026:30650 · 4 productsFor multicluster engine for Kubernetes, see the following documentation for details on how to install the images: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.13/html/clusters/cluster_mce_overview#mce-install-intro
- Vendor fix Red Hat Product Security RHSA-2026:29854 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied.
- Vendor fix Red Hat Product Security RHSA-2026:22465 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:10125 · 1 productRed Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev Platform Engineers, Software Develop…
Advisories and patches
- github.comRelease Notes
- github.comMitigation · Vendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2026-03-27
- Last Modified
- 2026-06-17
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-33747?
Is CVE-2026-33747 actively exploited?
What is the CVSS score for CVE-2026-33747?
Running moby/buildkit? Hear about its next vulnerability
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.