Medium severity · published Feb 27, 2026
CVE-2026-28407
malcontent's nested archive extraction failure can drop content from scan inputs
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
malcontent · chainguard-dev
< 1.21.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28407
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28407
Patch
https://github.com/chainguard-dev/malcontent/commit/356c56659ccfcad0b249a97de8cf71f151ed3ee9
Issue Tracking
https://github.com/chainguard-dev/malcontent/pull/1383
Patch
https://github.com/chainguard-dev/malcontent/security/advisories/GHSA-945p-3jhm-6rcp
More from malcontent
6.5
CVE-2026-24845
malcontent's OCI image scanning could expose registry credentials
5.0
CVE-2026-24846
malcontent's archive extraction could write outside extraction directory