🛡️ CVE-2026-28407 — malcontent

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-703 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

malcontent: Nested archive extraction failure can drop content from scan inputs

Previously, 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.

Fix: https://github.com/chainguard-dev/malcontent/pull/1383

Acknowledgements

malcontent thanks Oleh Konko from [1seal](https://1seal.org/) for discovering and reporting this issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Affected software

CVE-2026-28407 is recorded against 2 packages.

  • github.com/chainguard-dev/malcontent
  • malcontent (fixed in 1.21.0)

Timeline and source

Published on 28 February 2026 and last revised on 23 March 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-703
Public Exploit ✅ No
Source NVD
Published 2026-02-28
Updated 2026-08-12
Modified 2026-03-23

Affected Packages

Software From version Fixed in
github.com/chainguard-dev/malcontent — —
malcontent — 1.21.0

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