CVE-2026-93318
Cache poisoning via unvalidated image layer DiffIDs
No known exploitation. EPSS puts it in the 6th percentile. Fixed in 0.33.1.
What to do
Find your product and version, then upgrade to the build on the right.
- moby BuildKitAffected: < 0.33.1Upgrade to: 0.33.1Stated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
A malicious image can advertise DiffIDs from another image while containing different layer contents. In affected versions, BuildKit could use the advertised DiffIDs to derive cache and snapshot identity without validating that they matched the actual layer contents. If a BuildKit daemon with shared or persistent cache first processes such a malicious image, a later build using the victim image may mount the attacker-controlled layer contents as the base image. This can allow code from the malicious image to run in the victim build, for example by replacing a commonly executed path such as /bin/sh. The attacker-controlled code may read build secrets mounted into the build, access other build resources, alter output artifacts, or hang the build. The issue affects both regular snapshotters and lazy-pulling snapshotters such as stargz.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.2% chance of exploitation activity in the next 30 days, which ranks it in the 6th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
8 events over 1 day, from the signal feeds we watch.
- Workaround availablerecord updated
- Workaround availableworkaround available, published, weakness classified, record updated, record updated
Affected products
Technical detail
Weaknesses
Sources
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