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ExploitedPHP2Shell is now on CISA KEV

critical vulnerability

Echo: Rejected WebSocket upgrades can bypass Echo route-level access controls

Fix availableCritical · CVSS 9.1

Published Oct 23, 2026 · updated Oct 23, 2026

What to do

  1. Upgrade to a fixed version: github.com/labstack/echo/v4 4.16.1, github.com/labstack/echo/v5 5.4.1.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

Gogithub.com/labstack/echo/v4

Vulnerable versions
>= 4.0.0, < 4.16.1
Fixed in
4.16.1

Check your project: go list -m all | grep github.com/labstack/echo/v4

Gogithub.com/labstack/echo/v5

Vulnerable versions
>= 5.0.0, < 5.4.1
Fixed in
5.4.1

Check your project: go list -m all | grep github.com/labstack/echo/v5

What changed

  1. Oct 23, 2026

    Published in the GitHub Advisory Database as critical.

Sources

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') · CWE-863 Incorrect Authorization

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