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CVE-2026-103937

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

No known exploitation. EPSS puts it in the 42nd percentile. No fix published yet.

CVSS —Not scoredEPSS percentile42nd0.5% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixNone yetNo fix or workaround published

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build or workaround is published yet. Limit exposure and watch for a patch.

  • Misskey-dev MisskeyAffected: >= 12.0.0, <= 13.14.2Upgrade to: not statedAffected: >= 2023.9.0-beta.1, < 2025.4.1Upgrade to: not statedAffected: >= 2025.5.0, < 2026.7.0Upgrade to: not statedStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS42nd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.5% chance of exploitation activity in the next 30 days, which ranks it in the 42nd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

5 events over 3 days, from the signal feeds we watch.

  1. Record updated
  2. Record updated
  3. Publishedweakness classified, record updated

Affected products

Technical detail

Weaknesses

Sources

References in the record

And 1 more reference. See all after sign-in

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We'll flag the next CVE, public exploit or patch for Misskey, not every advisory.