High severity · published Aug 19, 2026
CVE-2026-75593
BuildKit: Malicious client can bypass destination directory validation on local sources upload
7.2
CVSS
0.5%
EPSS
No
On KEV
Description
BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.2, a custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access BuildKit control API to issue builds, eg., bypass authentication, etc. This issue is fixed in version 0.31.2.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BU
buildkit · moby
< 0.31.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-75593
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-75593
github.com
https://github.com/moby/buildkit/releases/tag/v0.31.2
github.com
https://github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976
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