How severe is CVE-2026-28407?

CVE-2026-28407 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-28407 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28407?

CVE-2026-28407 affects Chainguard Malcontent. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28407?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-28407 have an EU (EUVD) identifier?

Yes. CVE-2026-28407 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9078.

When was CVE-2026-28407 published?

CVE-2026-28407 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-28407

CVE-2026-28407 is a medium-severity vulnerability in Chainguard Malcontent with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-703.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9078
Weakness: CWE-703
Affected product: Chainguard Malcontent
Published: 2026-02-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-28407?: 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.
How severe is CVE-2026-28407?: CVE-2026-28407 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-28407 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28407?: CVE-2026-28407 affects Chainguard Malcontent. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28407?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28407 have an EU (EUVD) identifier?: Yes. CVE-2026-28407 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9078.
When was CVE-2026-28407 published?: CVE-2026-28407 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:chainguard:malcontent:*:*:*:*:*:*:*:*

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