Security Advisory

CVE-2026-46348

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-24 19:39:46

Last updated 2026-06-25 17:11:24

Assigner GitHub_M

CVSS score 8.7

State PUBLISHED

Description

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, the list of disallowed IP address ranges was lacking an IP address range that can be used to reach local IP addresses. An attacker can use an IP address in the affected range to make Mastodon perform HTTP requests against loopback interfaces, potentially allowing access to otherwise private resources and services. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

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