Vulnerability in Chainguard Malcontent
CVE-2026-28407
malcontent is software for discovering supply-chain compromises through context, differential analysis, and YARA. Prior to version 1.21.0, malcontent would remove nested archives which failed to extract which could potentially leave malicious content. A better approach is to preserve these archives so that malcontent can attempt a best-effort scan of the archive bytes. Version 1.21.0 fixes the issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
- Chainguard Malcontent
- Chainguard-Dev Malcontent — versions < 1.21.0
Weakness classification (CWE)
References
- github.com/chainguard-dev/malcontent/security/advisories/GHSA-945p-3jhm-6rcp (Patch, Vendor Advisory)
- github.com/chainguard-dev/malcontent/pull/1383 (Patch, Issue Tracking)
- github.com/chainguard-dev/malcontent/commit/356c56659ccfcad0b249a97de8cf71f151e… (Patch)
Frequently asked questions
- What is CVE-2026-28407?
- CVE-2026-28407 is a medium-severity vulnerability in Chainguard Malcontent, classified under CWE-703. CVSS score: 5.3/10. Published 2026-02-27.
- How severe is CVE-2026-28407?
- Medium severity. CVSS v3 base score is 5.3 out of 10.