CVE-2026-103937 Misskey: Denial of service resulting from insufficient cleanup processing during file uploads
Attackers can cause denial of service by exhausting storage or file descriptors through repeated file uploads due to insufficient cleanup processing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103937?
CVE-2026-103937 is a high-severity denial of service vulnerability in misskey-dev misskey, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-459
Which versions are affected by CVE-2026-103937?
How do I fix CVE-2026-103937?
No fix has been published for CVE-2026-103937 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-103937 being exploited?
There is no known exploitation of CVE-2026-103937 in the wild and no public exploit code.
Sources
Also known as GHSA-m9xp-2fvm-pfmq.