BuildKit Git URL subdir component can cause access to restricted files

CAO 7.5CVE-2026-33748 · GHSA-4vrq-3vrq-g6gg · GO-2026-4859 · Công bố 27/03/2026 · cập nhật 26/10/2026

Tóm tắt nhanh

CVE-2026-33748 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng github.com/moby/buildkit, buildkit (mobyproject).
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.48%, cao hơn 41.5% các lỗ hổng khác.
Cách xử lý: cập nhật lên 0.28.1 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
github.com/moby/buildkit Go	`< 0.28.1`	`0.28.1`
buildkit mobyproject	`< 0.28.1`	`0.28.1`

Mô tả

Impact

Insufficient validation of Git URL fragment subdir components (<url>#<ref>:<subdir>, docs) may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem.

Patches

The issue has been fixed in version v0.28.1

Workarounds

The issue affects only builds that use Git URLs with a subpath component. Avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.

Mô tả của NVD

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to version 0.28.1, insufficient validation of Git URL fragment subdir components may allow access to files outside the checked-out Git repository root. Possible access is limited to files on the same mounted filesystem. The issue has been fixed in version v0.28.1 The issue affects only builds that use Git URLs with a subpath component. As a workaround, avoid building Dockerfiles from untrusted sources or using the subdir component from an untrusted Git repository where the subdir component could point to a symlink.