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