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Vulnerability record · CVE-2026-33748 · published 27 March 2026

CVE-2026-33748: Mobyproject buildkit path traversal vulnerability

Mobyproject · Buildkit

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpath component. As a workaround, avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.

8.2 CVSS 4.0 High EPSS 0.53% · top 57.5% CWE-22 · Path traversalCWE-59 · Link following
8.2CVSS 4.0 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpath component. As a workaround, avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://docs.docker.com/build/concepts/context/#url-fragments Product
https://github.com/moby/buildkit/releases/tag/v0.28.1 ProductRelease Notes
https://github.com/moby/buildkit/security/advisories/GHSA-4vrq-3vrq-g6gg MitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-33747Mobyproject buildkit path traversal vulnerabilityBuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, when …EPSS 0.58%9.8CVE-2024-23653Mobyproject buildkit incorrect authorization vulnerabilityBuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. In addition to running contain…EPSS 3.0%9.1CVE-2024-23652Mobyproject buildkit path traversal vulnerabilityBuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. A malicious BuildKit frontend …EPSS 2.1%7.4CVE-2024-23651Mobyproject buildkit race condition vulnerabilityBuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Two malicious build steps runn…EPSS 0.79%7.3CVE-2026-15793Mobyproject buildkit argument injection vulnerabilityBuildKit custom frontends or clients using the raw low-level API can set git.checkoutbundle=true when checking out Git sources. If the Git source is …EPSS 0.35%6.9CVE-2026-15789Mobyproject buildkit path traversal vulnerabilityA custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The cli…EPSS 0.31%6.5CVE-2023-26054Mobyproject buildkit information exposure vulnerabilityBuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. In affected versions when the …EPSS 1.0%6.0CVE-2026-15792Mobyproject buildkit improper input validation vulnerabilityA malicious BuildKit client or frontend could craft a request that could lead to BuildKit daemon crashing with a panic.EPSS 0.42%

Source: NIST National Vulnerability Database (record CVE-2026-33748), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.