← CVE Intelligence

CVE-2026-46348

Mastodon: SSRF Bypass via IPv6 Unspecified Address (::) PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
mastodon / mastodonaffected >= 4.5.0-beta.1, < 4.5.10

CWE

CWE-918

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.