CVE-2026-93318

Cache poisoning via unvalidated image layer DiffIDs

CVE-2026-93318 is fixed in 4 products on 1 platform, first by ALAS2023-2026-3264, released November 7, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

n/a

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0017

6th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
docker · amzn 2023	25.0.18-1.amzn2023.0.3	ALAS2023-2026-3391	Nov 10, 2026
docker-debuginfo · amzn 2023	25.0.18-1.amzn2023.0.3	ALAS2023-2026-3391	Nov 10, 2026
docker-debugsource · amzn 2023	25.0.18-1.amzn2023.0.3	ALAS2023-2026-3391	Nov 10, 2026
runfinch-finch · amzn 2023	1.19.0-1.amzn2023.0.2	ALAS2023-2026-3264	Nov 7, 2026

Details

Published
October 9, 2026
Weakness
Improper Validation of Integrity Check Value
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93318

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