CVE-2026-104817CWE-405CWE-770CWE-918denial-of-servicessrf

CVE-2026-104817

published October 13, 2026

CVSS
8.7
EPSS
0%
Percentile
38.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
8.7 · NONE
CVSS v4.0
8.7 · 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
EPSS
0.00460 · 38.9th percentile
Weaknesses
CWE-405 · Asymmetric Resource Consumption (Amplification); CWE-770 · Allocation of Resources Without Limits or Throttling; CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-10-13T23:17Z
References (3)
https://github.com/misskey-dev/misskey/commit/a12ee2e5d72c40252e11a164b2231667c9697667 · [email protected]https://github.com/misskey-dev/misskey/releases/tag/2026.7.0 · [email protected]https://github.com/misskey-dev/misskey/security/advisories/GHSA-4x7v-qx8f-g3p8 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 13 OCT 18:39Z
    Misskey: Lack of rate limiting and size restrictions in RSS fetching API
    cvelistv5
  • 13 OCT 18:39Z
    Misskey: Lack of rate limiting and size restrictions in RSS fetching API
    cvelistv5