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

> An attacker can cause a denial of service in BuildKit by providing an oversized Dockerfile or .dockerignore file, exhausting daemon memory.

- **Severity:** Medium 6.8 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 5 Oct 2026
- **Also known as:** AZL-106746, AZL-106824, GHSA-mgqf-486f-49vp, UBUNTU-CVE-2026-93323

## What is CVE-2026-93323?

CVE-2026-93323 is a medium-severity denial of service vulnerability in moby BuildKit, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value)

## Which versions are affected by CVE-2026-93323?


## How do I fix CVE-2026-93323?

No fix has been published for CVE-2026-93323 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93323 being exploited?

There is no known exploitation of CVE-2026-93323 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93323 and fix it if it is affected.

What it is: CVE-2026-93323 is a medium-severity denial of service vulnerability in moby BuildKit, published on 5 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93323 in the wild and no public exploit code.

Affected product: moby BuildKit. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93323/ (Markdown: https://insights.sbomify.com/CVE-2026-93323/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93323
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93323
- OSV: https://osv.dev/vulnerability/CVE-2026-93323

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93323/
Summaries are generated and may contain mistakes; the official description above is the record.