High severityNVD Advisory· Published Oct 16, 2026· Updated Oct 16, 2026

CVE-2026-86009

Description

Mailu is a mail server distributed as a set of Docker images. Prior to f05aeb8322e2f61096af6b089d61ba6f40587d96, domain managers can enable spoofing for hosted domains they do not control. A potentially malicious domain administrator enables spoofing for another hosted domain and can send emails that are authenticated with DKIM/SPF for domains they should not be able to. This vulnerability is addressed by f05aeb8322e2f61096af6b089d61ba6f40587d96.

Affected products

Mailu/Mailullm-fuzzy
Range: <f05aeb8322e2f61096af6b089d61ba6f40587d96

Patches

Vulnerability mechanics

References

github.com/Mailu/Mailu/commit/f05aeb8322e2f61096af6b089d61ba6f40587d96nvd
github.com/Mailu/Mailu/issues/2686nvd
github.com/Mailu/Mailu/pull/4072nvd
github.com/Mailu/Mailu/security/advisories/GHSA-crww-m82r-2wfmnvd

News mentions

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cvss	0.455
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000