CVE-2026-84697: Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix
Published Sep 2, 2026
·Updated
Mailpit's IsInternalIP deny list function fails to block the Azure WireServer address 168.63.129.16 and the RFC 2765/6145 IPv4-translated IPv6 prefix, allowing server-side request forgery to internal destinations. Attackers can supply hostnames resolving to these addresses in message content to reach the link check API and proxy endpoint for accessing internal resources.
Affected Software
1 affected component
Mailpit
Event History
Sep 2, 2026
CVE Published
via MITRE·12:37 AM
Data Sourced
via MITRE·12:37 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·01:17 AM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Does exploitation require authentication or user interaction?
No. The vulnerability is network-reachable and is rated as requiring no privileges and no user interaction, with low attack complexity.
2
What security impact is indicated by the available severity data?
The severity data indicates low confidentiality impact. It does not indicate integrity or availability impact.