malcontent vulnerable to symlink Path Traversal via handleSymlink argument confusion in archive extraction

中 5.0CVE-2026-24846 · GHSA-923j-vrcg-hxwh · GO-2026-4391 · 29/01/2026 公開 · 17/06/2026 更新

要点

CVE-2026-24846 は github.com/chainguard-dev/malcontent, malcontent (chainguard) に影響する深刻度「中」 (CVSS 5.0) 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：1.20.3 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/chainguard-dev/malcontent Go	`≥ 1.8.0, < 1.20.3`	`1.20.3`
malcontent chainguard	`≥ 1.8.0, < 1.20.3`	`1.20.3`

概要

malcontent could be made to create symlinks outside the intended extraction directory when scanning a specially crafted tar or deb archive. The handleSymlink function received arguments in the wrong order, causing the symlink target to be used as the symlink location. Additionally, symlink targets were not validated to ensure they resolved within the extraction directory.

Fixes:

Acknowledgements

Thank you to Oleh Konko from 1seal for discovering and reporting this issue.

NVD の説明

malcontent discovers supply-chain compromises through. context, differential analysis, and YARA. Starting in version 1.8.0 and prior to version 1.20.3, malcontent could be made to create symlinks outside the intended extraction directory when scanning a specially crafted tar or deb archive. The `handleSymlink` function received arguments in the wrong order, causing the symlink target to be used as the symlink location. Additionally, symlink targets were not validated to ensure they resolved within the extraction directory. Version 1.20.3 introduces fixes that swap handleSymlink arguments, validate symlink location, and validate symlink targets that resolve within an extraction directory.