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Fedify: ActivityPub server framework

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🚨 Security Advisory: CVE-2025-68475

A ReDoS (Regular Expression Denial of Service) vulnerability has been discovered in Fedify's HTML parsing code. This vulnerability could allow a malicious federated server to cause denial of service by sending specially crafted HTML responses.

CVE ID CVE-2025-68475
Severity High (CVSS 7.5)
Affected versions ≤1.9.1
Patched versions 1.6.13, 1.7.14, 1.8.15, 1.9.2

If you're running Fedify in production, please upgrade to one of the patched versions immediately.

For full details, see the security advisory: https://github.com/fedify-dev/fedify/security/advisories/GHSA-rchf-xwx2-hm93

Thank you to Yue (Knox) Liu for responsibly reporting this vulnerability.

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