High 8.7Published Oct 13, 2026

CVE-2026-103937Misskey: Denial of service resulting from insufficient cleanup processing during file uploads

Updated under an hour ago (2026-10-19 08:30 UTC)

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It affects misskey-dev misskey. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.50%, higher than 42% of scored CVEs.

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Every CVE for misskey-dev misskey

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-459
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.50% (percentile 42)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

misskey-dev misskey misskey_dev:misskey (from the name)	from 12.0.0, <= 13.14.2; from 2023.9.0-beta.1, < 2025.4.1; from 2025.5.0, < 2026.7.0	CNA record

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-m9xp-2fvm-pfmqx-refsource-confirm
https://github.com/misskey-dev/misskey/pull/17750x-refsource-misc
https://github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e1261572b527x-refsource-misc
https://github.com/misskey-dev/misskey/releases/tag/2026.7.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.