CVE-2026-93318 (GCVE-0-2026-93318)

Vulnerability from cvelistv5 – Published: 2026-10-05 17:45 – Updated: 2026-10-05 19:06
VLAI
Title
Cache poisoning via unvalidated image layer DiffIDs
Summary
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.
Severity
7.5 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 19:06 UTC
CWE
  • CWE-354 - Improper Validation of Integrity Check Value
Assigner
References
Impacted products
Vendor Product Version CPE status
moby BuildKit Affected: 0 , < 0.33.1 (semver)
guessed Create a notification for this product.
Credits
Kohei Tokunaga (https://github.com/ktock)
Show details on NVD website
To clipboard 

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