CVE-2026-24843

melange QEMU runner could write files outside workspace directory

CVSS 3.1 8.2 HIGHEUVD CVSS 3.1 8.2 CVSS 3.1 · [email protected] · Secondary 8.2 HIGHCVSS 3.1 · [email protected] · Primary 8.4 HIGHCVSS_V3 Publisher rating HIGHFixed by chainguard.dev/melange 0.40.3osv · severity unknownFixed by chainguard.dev/melange 0.40.3KEV status unknown

Original advisory

cve-program · CVE-2026-24843

Published

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.

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euvd · EUVD-2026-5373

Published

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nvd · CVE-2026-24843

Published

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osv · GHSA-qxx2-7h4c-83f4

Published

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.

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osv · GO-2026-4407

Published

melange QEMU runner could write files outside workspace directory in chainguard.dev/melange

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Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-24843

Published

melange QEMU runner could write files outside workspace directory

Source published: 4 Feb 2026 19:31:35 UTC
Source modified: 5 Feb 2026 14:33:15 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 8.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

euvd · EUVD-2026-5373

Published

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 …

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Feb 4, 2026, 7:31:35 PM

dateUpdated: Feb 5, 2026, 2:33:15 PM

Source published: Feb 4, 2026, 7:31:35 PM (timezone not stated)
Source modified: Feb 5, 2026, 2:33:15 PM (timezone not stated)
Saved here: 15 Nov 2026 12:10:31 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 8.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

nvd · CVE-2026-24843

Published

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 …

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-22

Original publisher date fields

published: 2026-02-04T20:16:05.393

lastModified: 2026-06-17T10:23:41.390

1 source CPE criteria · context only

cpe:2.3:a:chainguard:melange:*:*:*:*:*:go:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 4 Feb 2026 20:16:05 UTC
Source modified: 17 Jun 2026 10:23:41 UTC
Saved here: 25 Oct 2026 06:17:10 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · [email protected] · Secondary · 8.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

CVSS 3.1 · [email protected] · Primary · 8.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

osv · GHSA-qxx2-7h4c-83f4

Published

melange QEMU runner could write files outside workspace directory

Source published: 3 Feb 2026 23:47:29 UTC
Source modified: 10 Sep 2026 03:50:59 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H

Publisher rating · HIGH

osv · GO-2026-4407

Published

melange QEMU runner could write files outside workspace directory in chainguard.dev/melange

Source published: 5 Feb 2026 03:20:45 UTC
Source modified: 5 Feb 2026 16:28:56 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.