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Misskey: Lack of rate limiting and size restrictions in RSS fetching API

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-104817

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-104817

misskey

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "misskey-dev",
    "product": "misskey",
    "versions": [
      {
        "status": "affected",
        "version": ">= 12.0.0, <= 13.14.2"
      },
      {
        "status": "affected",
        "version": ">= 2023.9.0-beta.1, < 2026.7.0"
      }
    ]
  }
]
Related CVEs
CVE-2026-104817

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#20675 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement