CVE-2026-72916
mediumPriorität · verfolgen · 0EPSS 0.006 · 48. PerzentilEUUSEPSS · bewertet 2026-10-27
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.21, 4.5.14, 4.6.4, and 4.7.0-beta.1, PrivateAddressCheck.private_address? in app/lib/private_address_check.rb normalized IPv4-mapped IPv6 addresses but did not recognize IPv4-compatible IPv6 addresses with IPAddr#ipv4_compat?. An attacker could supply an address in the omitted range to bypass the ALLOWED_PRIVATE_ADDRESSES protection and make Mastodon send HTTP requests to loopback interfaces, potentially accessing private resources and services. Exploitation requires a system that supports the obsolete IPv4-compatible IPv6 mechanism. This issue is fixed in versions 4.4.21, 4.5.14, 4.6.4, and 4.7.0-beta.1.
cvss
Technischer Schweregrad, 0–10. Eine Zeile je Quelle.
Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · low–medium · 1.7–6.3
schwächen
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betroffene Produkte (6)
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Advisories (1)
Hersteller- und Ökosystem-Meldungen dazu.
- BIT-mastodon-2026-72916Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Addresses2026-08-17vendor · osvUS
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.21, 4.5.14, 4.6.4, and 4.7.0, PrivateAddressCheck.private_address? in app/lib/private_address_check.rb normalized IPv4-mapped IPv6 addresses but did not recognize IPv4-compatible IPv6 addresses with IPAddr#ipv4_compat?. An attacker could supply an address in the omitted range to bypass the ALLOWED_PRIVATE_ADDRESSES protection and make Mastodon send HTTP requests to loopback interfaces, potentially accessing private resources and services. Exploitation requires a system that supports the obsolete IPv4-compatible IPv6 mechanism. This issue is fixed in versions 4.4.21, 4.5.14, 4.6.4, and 4.7.0.
auch bekannt als (3)
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quellen
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Referenzen (27)
Externe Belege — Patches, Meldungen, Analysen.
- https://github.com/mastodon/mastodon/commit/18c61f286f1f5718a8f517940ba384866ffa3892cnnvd
- https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074cnnvd
- https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373bcnnvd
- https://github.com/mastodon/mastodon/commit/da47a1bd3cd07935d7ca55a1f4f1a76f7f167e0dcnnvd
- https://github.com/mastodon/mastodon/releases/tag/v4.4.21cnnvd
- https://github.com/mastodon/mastodon/releases/tag/v4.5.14cnnvd
- https://github.com/mastodon/mastodon/releases/tag/v4.6.4cnnvd
- https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1cnnvd
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