lin-snow Ech0 up to 4.5.6 Public Router Group /api/echo/like/:id ID allocation of resources

Summaryinfo

A vulnerability marked as critical has been reported in lin-snow Ech0 up to 4.5.6. Affected by this vulnerability is an unknown functionality of the file /api/echo/like/:id of the component Public Router Group. The manipulation of the argument ID leads to allocation of resources. This vulnerability is documented as CVE-2026-79661. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in lin-snow Ech0 up to 4.5.6. This issue affects an unknown code of the file /api/echo/like/:id of the component Public Router Group. The manipulation of the argument id with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is integrity, and availability. The summary by CVE is:

Ech0 through 4.5.6 registers the PUT /api/echo/like/:id endpoint on the public router group without authentication or rate limiting. Unauthenticated attackers can increment the fav_count counter of any echo (including private echoes) by supplying its UUID, which can be harvested from the public GET /api/echo/page feed. Repeated requests are accepted without deduplication, each triggering a database write and a four-key cache invalidation, allowing attackers to inflate popularity metrics and amplify load on the database and cache. Fixed in 4.7.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-79661 since 08/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.7.3 eliminates this vulnerability.

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Productinfo

Vendor

• lin-snow

Name

• Ech0

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6

Website

• Product: https://github.com/lin-snow/Ech0/

CPE 2.3info

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