CVE-2026-93315

BuildKit proxy CA cleanup can be disrupted by build steps

Published Oct 5, 2026 CVSS 4.0 · 5.8 Medium EPSS < 1% KEV · Not listed
Description
When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.

Remediation

Vendor Workaround

Avoid using build sources from untrusted locations. Only builds enabling proxy networking for exec steps (either via BuildKitd TOML config or Buildx Rego policy) are affected.

Tracking

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Advisories

No advisories available
History
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 When proxy networking with CA injection is enabled, a build can modify its CA bundle before cleanup. This may cause cleanup to block, operate outside the build rootfs, or fail without failing the build.
Title BuildKit proxy CA cleanup can be disrupted by build steps
Weaknesses CWE-367
References
Metrics cvssV4_0

{'score': 5.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Docker
Published
Updated
Oct 6, 2026, 1:27 PM
Reserved
Sep 17, 2026, 5:17 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 10:16 PM
Modified
Oct 6, 2026, 3:08 PM