Symlink Attack Affecting github.com/moby/buildkit/executor/oci package, versions <0.31.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMMOBYBUILDKITEXECUTOROCI-18165790
- published22 Jul 2026
- disclosed20 Jul 2026
- creditJUNYI LIU
Introduced: 20 Jul 2026
CVE-2026-15788 Â (opens in a new tab)How to fix?
Upgrade github.com/moby/buildkit/executor/oci to version 0.31.2 or higher.
Overview
Affected versions of this package are vulnerable to Symlink Attack in the WCOW cache mount source selector, which resolves NTFS junctions in the cache mount source path outside the intended cache root. A user who can author a build run by the daemon can read arbitrary host files reachable to the BuildKit daemon process by pointing a cache mount source selector through an NTFS junction that escapes the cache root. Exploitation affects only BuildKit daemons configured for Windows Containers on Windows (WCOW) and requires the daemon to run a build from an untrusted source.