CVE-2026-24843

EUVD-2026-5373

04.02.2026, 20:16

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.

Path Traversal

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	8.2 HIGH	LOCAL	LOW	NONE	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
GitHub_M	CNA	8.2 HIGH	LOCAL	LOW	NONE	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Affected Products (NVD)

Vendor	Product	Version
chainguard	melange	0.11.3 ≤ 𝑥 < 0.40.5

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References

https://github.com/chainguard-dev/melange/commit/6e243d0d46699f837d7c392397a694d2bcc7612b

https://github.com/chainguard-dev/melange/security/advisories/GHSA-qxx2-7h4c-83f4