CVE-2026-79661: Allocation of Resources Without Limits or Throttling in lin-snow Ech0
Description
Ech0 versions prior to 4.7.3 have a vulnerability in the PUT /api/echo/like/:id endpoint that allows unauthenticated attackers to increment the fav_count of any echo, including private ones, without rate limiting. This can be exploited to artificially inflate popularity metrics and cause increased load on the database and cache. The issue is fixed in version 4.7.3.
CVSS v4.0
Score 6.9medium
Affected software
lin-snow
Ech0
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Ech0 through version 4.5.6 exposes a PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Attackers can supply the UUID of any echo, harvested from the public GET /api/echo/page feed, to increment its fav_count repeatedly. Each request triggers a database write and cache invalidation without deduplication, enabling resource exhaustion and manipulation of popularity metrics. This vulnerability is addressed in Ech0 version 4.7.3.
Potential Impact
Unauthenticated attackers can inflate the fav_count metric of any echo, including private echoes, causing inaccurate popularity data. The repeated requests also amplify load on the backend database and cache systems, potentially degrading service performance or availability.
Mitigation Recommendations
Upgrade Ech0 to version 4.7.3 or later, where this vulnerability is fixed. Prior versions lack authentication and rate limiting on the affected endpoint, so patching is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-25T11:09:11.171Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8d820cacd9273b49225408
Added to database: 08/25/2026, 11:52:44 UTC
Last enriched: 09/10/2026, 19:47:56 UTC
Last updated: 10/07/2026, 06:48:18 UTC
Views: 35
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