High 8.7Published Oct 13, 2026

CVE-2026-104817Misskey: Lack of rate limiting and size restrictions in RSS fetching API

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 0.46%, higher than 38% 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 12.112.1 until 2026.7.0, the unauthenticated fetch-rss API lacks rate limiting and response-size restrictions and performs synchronous XML parsing. An attacker can trigger unbounded outbound HTTP requests and synchronous parsing, exhausting instance resources, amplifying requests toward third-party servers, or probing network-reachable services even when federation is disabled. 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:L/SI:N/SA:L
Weakness (CWE): CWE-405, CWE-770, CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.46% (percentile 38)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 13, 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, < 2026.7.0	CNA record

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-4x7v-qx8f-g3p8x-refsource-confirm
https://github.com/misskey-dev/misskey/commit/a12ee2e5d72c40252e11a164b2231667c9697667x-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.