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CVE-2026-93318

HIGH 7.5

Published 2026-10-05 · Last modified 2026-10-05

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.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 6th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 4.0 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityLow

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: Requires active user interaction
  • ✓Complexity: No special conditions — reliably repeatable
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Moby

Products Buildkit

Weakness (CWE)

  • CWE-354: : Improper Validation of Integrity Check Value

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • buildah.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-93318 · Updated 2026-10-20T18:54:52+00:00
  • podman.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-93318 · Updated 2026-10-20T18:54:52+00:00
  • trivy.src as a component of Red Hat Hardened Images · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/[email protected]?arch=src

    Red Hat · CVE-2026-93318 · Updated 2026-10-20T18:54:52+00:00
  • quay/quay-builder-rhel8 as a component of Red Hat Quay 3 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not in execute path

    pkg:oci/quay-builder-rhel8?repository_url=registry.redhat.io/quay/quay-builder-rhel8

    Red Hat · CVE-2026-93318 · Updated 2026-10-20T18:54:52+00:00
  • quay/quay-builder-rhel9 as a component of Red Hat Quay 3 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not in execute path

    pkg:oci/quay-builder-rhel9?repository_url=registry.redhat.io/quay/quay-builder-rhel9

    Red Hat · CVE-2026-93318 · Updated 2026-10-20T18:54:52+00:00

All CVSS metrics

  • HIGH 7.5 v4.0 · CNA Primary
    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
  • HIGH 7.5 v4.0 · NVD Secondary
    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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS