CVE-2026-93315

BuildKit proxy CA cleanup can be disrupted by build steps

State: Published
Severity: 5.8 Medium
Published: Oct 5, 2026
Updated: Oct 6, 2026
Reserved: Sep 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.8 Medium	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	Docker

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
BuildKitmoby	0.31.0 to before 0.33.1Affected

References

https://github.com/moby/buildkit/security/advisories/GHSA-2f5p-x9ph-g97xvendor-advisory
https://github.com/moby/buildkit/releases/tag/v0.33.1patch

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