CVE-2026-93323: Oversized Dockerfile or .dockerignore can exhaust buildkitd memory

Severity: medium (CVSS 6.8 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-05 · updated 2026-10-06
Weakness: CWE-789

Description

The Dockerfile frontend loaded the Dockerfile and .dockerignore files of a build context into memory without a size limit. A build context containing an oversized file could make buildkitd allocate memory proportional to that file, potentially exhausting memory and terminating the daemon, which interrupts other builds on the same instance. Fixed by rejecting such files above 16 MiB.

Affected products

moby BuildKit: through 0.33.0

References

https://github.com/moby/buildkit/releases/tag/v0.33.1
https://github.com/moby/buildkit/security/advisories/GHSA-mgqf-486f-49vp

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