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.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93323 being exploited?
There is no known exploitation of CVE-2026-93323 in the wild and no public exploit code.
Sources
Also known as AZL-106746, AZL-106824, GHSA-mgqf-486f-49vp, UBUNTU-CVE-2026-93323.