---
title: "CVE-2026-103937: Misskey - Denial of Service"
description: "Misskey 13.0.0 to 2025.4.1 and 2025.5.0 to 2026.7.0 contains a denial of service caused by missing cleanup during file uploads, letting attackers exhaust storage or file descriptors, exploit requires repeated file uploads."
url: https://panop.io/threat-heartbeat/CVE-2026-103937/
---

# CVE-2026-103937 Misskey - Denial of Service

Misskey 13.0.0 to 2025.4.1 and 2025.5.0 to 2026.7.0 contains a denial of service caused by missing cleanup during file uploads, letting attackers exhaust storage or file descriptors, exploit requires repeated file uploads.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.50% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103937)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

13 October 2026

Updated

15 October 2026

Weakness

[CWE-459](https://cwe.mitre.org/data/definitions/459.html)

## Vendor fix

Update to version 2026.7.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103937](https://nvd.nist.gov/vuln/detail/CVE-2026-103937)
- [https://github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e1261572b527](https://github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e1261572b527)
- [https://github.com/misskey-dev/misskey/pull/17750](https://github.com/misskey-dev/misskey/pull/17750)
- [https://github.com/misskey-dev/misskey/releases/tag/2026.7.0](https://github.com/misskey-dev/misskey/releases/tag/2026.7.0)
- [https://github.com/misskey-dev/misskey/security/advisories/GHSA-m9xp-2fvm-pfmq](https://github.com/misskey-dev/misskey/security/advisories/GHSA-m9xp-2fvm-pfmq)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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