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

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Summary

CVECVE-2026-103937
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 19:17:54 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionMisskey 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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

EPSS: 0.005010000 probability, percentile 0.415620000 (date 2026-10-16)

Problem Types: CWE-459 | CWE-459 CWE-459: Incomplete Cleanup

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS: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/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Misskey-dev Misskey affected >= 12.0.0, <= 13.14.2 Not specified
CNA Misskey-dev Misskey affected >= 2023.9.0-beta.1, < 2025.4.1 Not specified
CNA Misskey-dev Misskey affected >= 2025.5.0, < 2026.7.0 Not specified

References

ReferenceSourceLinkTags
github.com/misskey-dev/misskey/pull/17750 [email protected] github.com
github.com/misskey-dev/misskey/releases/tag/2026.7.0 [email protected] github.com
github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e12615... [email protected] github.com
github.com/misskey-dev/misskey/security/advisories/GHSA-m9xp-2fvm-pfmq [email protected] github.com
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