Answer in brief
CVE-2026-79661 records a Medium severity (CVSS 6.5) vulnerability in Ech0 before 4.7.3 Unauthenticated fav_count Modification. The current sources do not mark it as known exploited. The current feed maps lin-snow/Ech0 (generic), github.com/lin-snow/ech0 (go), github.com/lin-snow/Ech0 (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps lin-snow/Ech0 (generic), github.com/lin-snow/ech0 (go), github.com/lin-snow/Ech0 (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| lin-snow/Ech0generic | >=0 <4.7.3 | 4.7.3 |
| github.com/lin-snow/ech0go | >=0 <1.4.8-0.20260503035905-cecc2c19b590 | 1.4.8-0.20260503035905-cecc2c19b590 |
| github.com/lin-snow/Ech0go | >=0 <1.4.8-0.20260503035905-cecc2c19b590 | 1.4.8-0.20260503035905-cecc2c19b590 |
Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.