CVE-2026-28407: Chainguard Malcontent

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Chainguard Malcontent: before 1.21.0 (fixed in 1.21.0)

Published 2026-02-27. Last modified 2026-06-17.