{"id":"CVE-2026-84697","title":"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","summary":"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 ho…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-918"],"published":"2026-09-02","updated":"2026-09-10","sourceUpdated":"2026-09-10T15:53:23.707","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84697","references":[{"url":"https://github.com/axllent/mailpit","label":"disclosure@vulncheck.com"},{"url":"https://github.com/axllent/mailpit/blob/v1.31.0/internal/tools/net.go","label":"disclosure@vulncheck.com"},{"url":"https://github.com/axllent/mailpit/commit/a02821bf3424da9196e156c422370f4868a1dff2","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/mailpit-ssrf-deny-list-bypass-via-azure-metadata-and-ipv6-prefix","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00245,"epssPercentile":0.15946,"ingestedAt":"2026-09-10T16:57:28.700Z","slug":"CVE-2026-84697","body":"## Overview\n\nMailpit'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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}