VULNERABILITY INTELLIGENCE

CVE-2026-47389

CVSS score8.6 HIGH
EPSS probability0.39%
CISA KEVNot currently listed
Published2026-06-24
Last modified2026-06-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

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, 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.

Weakness classification

  • CWE-184: Incomplete List of Disallowed Inputs
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-918: Server-Side Request Forgery (SSRF)

Primary references