CVE-2026-104817: DoS

Description

Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled. This issue is fixed in version 2026.7.0.

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Weakness Type (CWE)

CWE-405 CWE-405

CWE-770 CWE-770

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

https://github.com/misskey-dev/misskey/commit/a12ee2e5d72c40252e11a164b2231667c9697667 https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 https://github.com/misskey-dev/misskey/security/advisories/GHSA-4x7v-qx8f-g3p8

Frequently Asked Questions

What is CVE-2026-104817? +

Misskey is an open source, federated social media platform. From 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled. This issue is fixed in version 2026.7.0.

How do I check if I'm vulnerable to CVE-2026-104817? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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