Vulnerability · Published Oct 13, 2026 · Assigned by GitHub_M
CVE-2026-103937Misskey: Denial of service resulting from insufficient cleanup processing during file uploads
High 8.7
In plain English
A high-severity security flaw in misskey from misskey-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| misskey-dev | misskey | >= 12.0.0, <= 13.14.2>= 2023.9.0-beta.1, < 2025.4.1>= 2025.5.0, < 2026.7.0 |
Weakness: CWE-459 · 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
References
- https://github.com/misskey-dev/misskey/security/advisories/GHSA-m9xp-2fvm-pfmq x_refsource_CONFIRM
- https://github.com/misskey-dev/misskey/pull/17750 x_refsource_MISC
- https://github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e1261572b527 x_refsource_MISC
- https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 x_refsource_MISC