CVE-2026-84697

EUVD-2026-69788
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.
SSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 15.52%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
axllentmailpit
𝑥
≤ 1.31.0
CNA
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/axllent/mailpit
https://github.com/axllent/mailpit/blob/v1.31.0/internal/tools/net.go
https://github.com/axllent/mailpit/commit/a02821bf3424da9196e156c422370f4868a1dff2
https://www.vulncheck.com/advisories/mailpit-ssrf-deny-list-bypass-via-azure-metadata-and-ipv6-prefix