🛡️ CVE-2026-46348 — mastodon
Description
Mastodon: SSRF Bypass via IPv6 Unspecified Address (::)
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 software
CVE-2026-46348 is recorded against 2 packages.
- mastodon
- unknown
Timeline and source
Published on 6 July 2026 and last revised on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.
References
Details
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| mastodon | — | — |
| unknown | — | — |
References
Similar Threats
- Critical CVE-2022-2166
- High CVE-2023-49952
- Medium CVE-2024-34535
- High CVE-2024-25618
- Medium CVE-2024-25619
Site Security Check
Is mastodon part of your stack?
CVE-2026-46348 is rated CVSS 8.0 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.
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