What’s Vulnerable › Vulnerabilities

CVE-2026-28407: malcontent's nested archive extraction failure can drop content from scan inputs

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-27 · updated 2026-06-17
• Weakness: CWE-703

Description

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-dev malcontent: before 1.21.0 — fixed in 1.21.0

How to fix

Upgrade to a fixed version: chainguard-dev malcontent 1.21.0. Check the vendor advisory for mitigations.

References

• https://github.com/chainguard-dev/malcontent/commit/356c56659ccfcad0b249a97de8cf71f151ed3ee9
• https://github.com/chainguard-dev/malcontent/pull/1383
• https://github.com/chainguard-dev/malcontent/security/advisories/GHSA-945p-3jhm-6rcp

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