high8.2
CVE-2026-24843
melange QEMU runner could write files outside workspace directory
Impact
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](https://github.com/chainguard-dev/melange/commit/6e243d0d46699f837d7c392397a694d2bcc7612b). Merged in release. **Acknowledgements** melange thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | chainguard.dev/melange | >= 0.11.3, < 0.40.3 | 0.40.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Chainguard | Melange | from 0.11.3 before 0.40.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/chainguard-dev/melange/commit/6e243d0d46699f837d7c392397a694d2bcc7612b
- https://github.com/chainguard-dev/melange/security/advisories/GHSA-qxx2-7h4c-83f4
- https://github.com/advisories/GHSA-qxx2-7h4c-83f4
- https://nvd.nist.gov/vuln/detail/CVE-2026-24843