CVE-2026-103937

Misskey: Denial of service resulting from insufficient cleanup processing during file uploads

State: Published
Severity: 8.7 High
Published: Oct 13, 2026
Updated: Oct 14, 2026
Reserved: Oct 1, 2026

Description

Misskey is an open source, federated social media platform. From 13.0.0 until 2025.4.1 and from 2025.5.0 until 2026.7.0, cleanup processing may not execute during file uploads. Repeated uploads can exhaust storage or file descriptors and deny service regardless of whether federation is enabled. This issue is fixed in version 2026.7.0.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-459 Incomplete Cleanup

Affected Products

Product	Versions
misskeymisskey-dev	>= 12.0.0, <= 13.14.2Affected >= 2023.9.0-beta.1, < 2025.4.1Affected >= 2025.5.0, < 2026.7.0Affected

References

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