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.
History

Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 02 Sep 2026 01:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix
First Time appeared Axllent
Axllent mailpit
Weaknesses CWE-918
CPEs cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*
Vendors & Products Axllent
Axllent mailpit
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-02T00:37:53.020Z

Updated: 2026-09-02T14:35:43.099Z

Reserved: 2026-09-01T23:24:24.109Z

Link: CVE-2026-84697

cve-icon Vulnrichment

Updated: 2026-09-02T14:35:40.450Z

cve-icon NVD

Status : Received

Published: 2026-09-02T01:17:24.703

Modified: 2026-09-02T15:17:45.967

Link: CVE-2026-84697

cve-icon Redhat

No data.