CVE-2025-46553: Misskey Summaly

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

@misskey-dev/summaly is a tool for getting a summary of a web page. Starting in version 3.0.1 and prior to version 5.2.1, a logic error in the main `summaly` function causes the `allowRedirects` option to never be passed to any plugins, and as a result, isn't enforced. Misskey will follow redirects, despite explicitly requesting not to. Version 5.2.1 contains a patch for the issue.

Affected products

• Misskey Summaly: from 3.0.1, before 5.2.1 (fixed in 5.2.1)

Published 2025-05-05. Last modified 2026-06-17.