6.9

CVE-2026-28407: chainguard-dev malcontent

CVSS: 6.9v4.0MediumAnalyzed
AliasesGHSA-945p-3jhm-6rcpGO-2026-4577
Published 27-02-2026Last modified 02-03-2026
Open JSON

Vulnerability summary

CVE-2026-28407 is a medium (CVSS 6.9) vulnerability in chainguard-dev malcontent. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.2% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1042-1

Timeline

  1. 27-02-2026
    PublishedVulnerability first disclosed.
  2. 02-03-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.05 pp

From 0.35% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard1 product
Chainguard-dev1 product
Github.com/chainguard-dev1 product
  • malcontent< 1.21.0

3 vendors · 3 products

References

5 links