CVE-2025-46553: @misskey-dev/summaly Redirect Filter Bypass

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-05 · updated 2026-06-17
Weakness: CWE-601

Description

@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-dev summaly: from 3.0.1 before 5.2.1 — fixed in 5.2.1

How to fix

Upgrade to a fixed version: misskey-dev summaly 5.2.1. Check the vendor advisory for mitigations.

References

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