How severe is CVE-2026-33747?

CVE-2026-33747 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33747 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33747?

CVE-2026-33747 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33747?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33747 have an EU (EUVD) identifier?

Yes. CVE-2026-33747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16518.

When was CVE-2026-33747 published?

CVE-2026-33747 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-33747

CVE-2026-33747 is a high-severity vulnerability in Mobyproject Buildkit with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16518
Weakness: CWE-22
Affected product: Mobyproject Buildkit
Published: 2026-03-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33747?: 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.
How severe is CVE-2026-33747?: CVE-2026-33747 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33747 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33747?: CVE-2026-33747 affects Mobyproject Buildkit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33747?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33747 have an EU (EUVD) identifier?: Yes. CVE-2026-33747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16518.
When was CVE-2026-33747 published?: CVE-2026-33747 was published on 2026-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mobyproject:buildkit:*:*:*:*:*:*:*:*

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