CVE-2026-84697 Mailpit SSRF Deny List Bypass via Azure Metadata and IPv6 Prefix
Attackers can bypass IP deny lists to perform server-side request forgery, accessing internal resources via Azure metadata or IPv6 prefixes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84697?
CVE-2026-84697 is a medium-severity server-side request forgery vulnerability in axllent mailpit, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-84697?
How do I fix CVE-2026-84697?
No fix has been published for CVE-2026-84697 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-84697 being exploited?
There is no known exploitation of CVE-2026-84697 in the wild and no public exploit code.
Sources
Also known as GHSA-qx8f-9cjx-54j9.