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CVE-2026-72916

Published Aug 10, 2026 CWE-918

Overview

CVE-2026-72916 is a known-severity vulnerability. It was published on August 10, 2026.

Technical Description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHub github.com/mastodon/mastodon/commit/18c61f286f1f5718a8f517940ba384866ffa3892 GitHub github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074 GitHub github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b GitHub github.com/mastodon/mastodon/commit/da47a1bd3cd07935d7ca55a1f4f1a76f7f167e0d GitHub github.com/mastodon/mastodon/releases/tag/v4.4.21 GitHub github.com/mastodon/mastodon/releases/tag/v4.5.14 GitHub github.com/mastodon/mastodon/releases/tag/v4.6.4 GitHub github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1 GitHub github.com/mastodon/mastodon/security/advisories/GHSA-vwhj-3g83-v276

Frequently Asked Questions

What is CVE-2026-72916?

CVE-2026-72916 is a known-severity vulnerability. It was published on August 10, 2026.

How severe is CVE-2026-72916?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-72916?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72916?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-72916 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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HackBrowser

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