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.
Published: 2026-09-02
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

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'}

Subscriptions

Axllent Mailpit
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

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

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

Link: CVE-2026-84697

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-84697

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-918

    Server-Side Request Forgery (SSRF)