melange has a path traversal in license-path which allows reading files outside workspace

中 5.5CVE-2026-25145 · GHSA-2w4f-9fgg-q2v9 · GO-2026-4409 · 04/02/2026 公開 · 17/06/2026 更新

要点

CVE-2026-25145 は chainguard.dev/melange, melange (chainguard) に影響する深刻度「中」 (CVSS 5.5) 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 8.9% 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	`≥ 0.14.0, < 0.40.3`	`0.40.3`
melange chainguard	`≥ 0.14.0, < 0.40.5`	`0.40.5`

概要

An attacker who can influence a melange configuration file (e.g., through pull request-driven CI or build-as-a-service scenarios) could read arbitrary files from the host system. The LicensingInfos function in pkg/config/config.go reads license files specified in copyright[].license-path without validating that paths remain within the workspace directory, allowing path traversal via ../ sequences. The contents of the traversed file are embedded into the generated SBOM as license text, enabling exfiltration of sensitive data through build artifacts.

Fix: Merged in commit 2f95c9f4

Acknowledgements

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

NVD の説明

melange allows users to build apk packages using declarative pipelines. From version 0.14.0 to before 0.40.3, an attacker who can influence a melange configuration file (e.g., through pull request-driven CI or build-as-a-service scenarios) could read arbitrary files from the host system. The LicensingInfos function in pkg/config/config.go reads license files specified in copyright[].license-path without validating that paths remain within the workspace directory, allowing path traversal via ../ sequences. The contents of the traversed file are embedded into the generated SBOM as license text, enabling exfiltration of sensitive data through build artifacts. This issue has been patched in version 0.40.3.