melange QEMU runner could write files outside workspace directory

高 8.4CVE-2026-24843 · GHSA-qxx2-7h4c-83f4 · GO-2026-4407 · 04/02/2026 公開 · 17/06/2026 更新

要点

CVE-2026-24843 は chainguard.dev/melange, melange (chainguard) に影響する深刻度「高」 (CVSS 8.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.19%（全脆弱性の 8.3% より高い）。
対処：0.40.3, 0.40.5 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
chainguard.dev/melange Go	`≥ 0.11.3, < 0.40.3`	`0.40.3`
melange chainguard	`≥ 0.11.3, < 0.40.5`	`0.40.5`

概要

An attacker who can influence the tar stream from a QEMU guest VM could write files outside the intended workspace directory on the host. The retrieveWorkspace function extracts tar entries without validating that paths stay within the workspace, allowing Path Traversal via ../ sequences.

Fix: Fixed in 6e243d0d. Merged in release.

Acknowledgements

melange thanks Oleh Konko from 1seal for discovering and reporting this issue.

NVD の説明

melange allows users to build apk packages using declarative pipelines. In version 0.11.3 to before 0.40.3, an attacker who can influence the tar stream from a QEMU guest VM could write files outside the intended workspace directory on the host. The retrieveWorkspace function extracts tar entries without validating that paths stay within the workspace, allowing path traversal via ../ sequences. This issue has been patched in version 0.40.3.