Build breakout using malicious Containerfile and Git Smart HTTP server or GitHub release tar archive

中 6.3CVE-2026-44517 · GHSA-49p4-px3h-rq49 · GO-2026-5116 · 21/08/2026 公開 · 12/10/2026 更新

要点

CVE-2026-44517 は github.com/containers/buildah に影響する深刻度「中」 (CVSS 6.3) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.18%（全脆弱性の 8.0% より高い）。
対処：1.43.2 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/containers/buildah Go	`≥ 1.38.1, < 1.43.2≥ 1.38.1`	`1.43.2`

概要

Impact

When processing a build contexts or add/copy instructions, a malicious server serving a Git repository or a tar archive file can cause files outside of the build context directory to be included in the build context or copied into the build.

Patches

Fixed in Buildah 1.44 and 1.43.2.

NVD の説明

Buildah is a tool that facilitates building OCI images. From 1.38.1 until 1.43.2 and 1.44.0, TempDirForURL in define/types.go does not securely confine Git repository subdirectories to the downloaded build context, and downloadToDirectory and stdinToDirectory can follow a Dockerfile symlink left by a partially extracted tar archive. A malicious server supplying a Git repository or tar archive can cause files outside the build context directory to be included in the context or copied into the build. This issue is fixed in versions 1.43.2 and 1.44.0.