CVE-2026-47389
- Source
- https://cve.org/CVERecord?id=CVE-2026-47389
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47389.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-47389
- Aliases
-
- BIT-mastodon-2026-47389
- GHSA-xx55-4rrg-8xg6
- Published
- 2026-06-24T19:41:21.150Z
- Modified
- 2026-07-15T01:49:13.667486177Z
- Severity
-
- 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
- Summary
- Mastodon: SSRF protection bypass on older Ruby versions
- Details
-
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, when using Ruby versions older than 3.4, PrivateAddressCheck.private_address? returns false for IPv4-mapped IPv6 addresses (::ffff:a.b.c.d) corresponding to some private IPv4 addresses, depending on Ruby version, this can include loopback, RFC1918 private networks, and link-local space. An attacker who controls DNS for any domain can publish an AAAA record with such a mapped address; any outbound HTTP fetch Mastodon performs against that hostname then opens a real TCP connection to the underlying IPv4 address, including 127.0.0.1 and cloud-metadata endpoints such as 169.254.169.254. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47389.json", "cwe_ids": [ "CWE-184", "CWE-200", "CWE-918" ], "cna_assigner": "GitHub_M" }- References