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CVE-2026-84697— Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix

Quick assessment

Affected
axllent mailpit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ralph Slooten Mailpit是Ralph Slooten个人开发者的一款面向开发者的小型、快速、低内存、零依赖、多平台的电子邮件测试工具和 API。 Ralph Slooten Mailpit 1.31.0及之前版本存在服务端请求伪造漏洞，该漏洞源于IsInternalIP拒绝列表函数未能阻止Azure WireServer地址168.63.129.16和RFC 2765/6145 IPv4转换IPv6前缀，可能导致服务端请求伪造，攻击者可在消息内容中提供解析到这些地址的主机名以访问内部资源

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1012 · Query Registry

Affected Version Matrix 1

VendorProduct Version RangeStatus
axllent mailpit ≤ 1.31.0 affected
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I. Basic Information for CVE-2026-84697

Vulnerability Information
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Vulnerability Title
Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Ralph Slooten Mailpit 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ralph Slooten Mailpit是Ralph Slooten个人开发者的一款面向开发者的小型、快速、低内存、零依赖、多平台的电子邮件测试工具和 API。 Ralph Slooten Mailpit 1.31.0及之前版本存在服务端请求伪造漏洞，该漏洞源于IsInternalIP拒绝列表函数未能阻止Azure WireServer地址168.63.129.16和RFC 2765/6145 IPv4转换IPv6前缀，可能导致服务端请求伪造，攻击者可在消息内容中提供解析到这些地址的主机名以访问内部资源
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
axllent mailpit 0 ~ 1.31.0 -

II. Public POCs for CVE-2026-84697

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III. Intelligence Information for CVE-2026-84697

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Patches & Fixes for CVE-2026-84697 (2)

Vendor Advisories for CVE-2026-84697 (1)

IV. Related Vulnerabilities

Same product: mailpit
Same vendor: axllent
Same weakness: CWE-918

V. Comments for CVE-2026-84697

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