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CVE-2026-47389

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;
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0df542a58efbe5c11e2c135a3dffae5b60015672eb537b6b5114e81d9e619cbb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-184","description":"CWE-184: Incomplete List of Disallowed Inputs","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

1 source assertion
{"product":"mastodon","vendor":"mastodon","versions":[{"status":"affected","version":">= 4.5.0-beta.1, < 4.5.10"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-184","description":"CWE-184: Incomplete List of Disallowed Inputs","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/problemTypes/2/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/mastodon/mastodon/security/advisories/GHSA-xx55-4rrg-8xg6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-xx55-4rrg-8xg6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:434a3dd2c4379384be06cf3b27d9cb7f97a0388a8a65eaeed35cdfb0bd088482 · sha256:5563532e86b30376… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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