CVE-2026-103937

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.

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Weakness Type (CWE)

CWE-459 CWE-459

References

Other References

https://github.com/misskey-dev/misskey/commit/3f28489fb856e6e07a16290f3ea1e1261572b527 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/security/advisories/GHSA-m9xp-2fvm-pfmq

Frequently Asked Questions

What is CVE-2026-103937? +

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.

How do I check if I'm vulnerable to CVE-2026-103937? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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