CVE-2026-93317

Container blob cache can accept unverified content

Published Oct 5, 2026 CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Description
An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.

Remediation

Vendor Workaround

The issue only affects the low-level LLB API with direct blob access from the registry. It can't be reached with Dockerfile builds.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}

threat_severity

Moderate

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Moby
Moby buildkit
Vendors & Products Moby
Moby buildkit
Type Values Removed Values Added
Description An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.
Title Container blob cache can accept unverified content
Weaknesses CWE-354
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Docker
Published
Updated
Oct 5, 2026, 7:06 PM
Reserved
Sep 17, 2026, 5:17 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 6:17 PM
Modified
Oct 6, 2026, 3:08 PM
Severity
Moderate
Public date
Oct 5, 2026, 5:43 PM