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

Quick assessment

Affected
misskey-dev misskey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Misskey 是一个开源的、去中心化的社交平台。在版本 13.0.0 到 2025.4.1，以及版本 2025.5.0 到 2026.7.0 之间，文件上传过程中可能无法执行清理处理。频繁上传文件会导致存储空间或文件描述符耗尽，从而造成服务拒绝，无论是否启用了联邦功能。该问题已在版本 2026.7.0 中得到修复。

CVSS 8.7 · High EPSS 0.50% · P41

Affected Version Matrix 3

VendorProduct Version RangeStatus
misskey-dev misskey >= 12.0.0, <= 13.14.2 affected
>= 2023.9.0-beta.1, < 2025.4.1 affected
>= 2025.5.0, < 2026.7.0 affected
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I. Basic Information for CVE-2026-103937

Vulnerability Information
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Vulnerability Title
Misskey: Denial of service resulting from insufficient cleanup processing during file uploads
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey >= 12.0.0, <= 13.14.2 -

II. Public POCs for CVE-2026-103937

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III. Intelligence Information for CVE-2026-103937

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Patches & Fixes for CVE-2026-103937 (1)

Vendor Advisories for CVE-2026-103937 (1)

Vendor Pages for CVE-2026-103937 (1)

Same Patch Batch · misskey-dev · 2026-10-13 · 3 CVEs total

CVE-2026-104817 8.7 HIGH Misskey: Lack of rate limiting and size restrictions in RSS fetching API
CVE-2026-104816 8.5 HIGH Misskey: Cross-site scripting in RSS feed item links

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-459

V. Comments for CVE-2026-103937

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