CVE-2026-118264
Critical
Description
Echo: Rejected WebSocket upgrades can bypass Echo route-level access controls
SeverityCritical
CVSS9.1
Exploit probability—
ProductGithub.com/labstack/echo/v4
PublishedOct 23, 2026
First seenOct 23, 2026
Weakness typeCWE-444CWE-444CWE-863Incorrect authorization
How to fix
Update
- github.com/labstack/echo/v44.16.1 or later
- github.com/labstack/echo/v55.4.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/labstack/echo/v4Go | 4.0.0 ≤ v < 4.16.1 | 4.16.1 |
| github.com/labstack/echo/v5Go | 5.0.0 ≤ v < 5.4.1 | 5.4.1 |
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