Vulnerability in misskey-dev misskey

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

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