Vulnerability 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-46348?
CVE-2026-46348 is a documented vulnerability. 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 us...
How severe is CVE-2026-46348?
CVSS scoring is not yet available for CVE-2026-46348. Check NVD for updates.
Is there a patch for CVE-2026-46348?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.