CVE-2026-22771CWE-94

Envoy Extension Policy lua scripts injection causes arbitrary command execution

High · published January 12, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
49.1
In the wild
Unconfirmed
What it is

⚡ Envoy's Lua scripts have a surprising twist! Before versions 1.5.7 and 1.6.2, they can inadvertently leak your proxy's credentials, like leaving the keys to your castle on the welcome mat. 🔑 Think of it like a hotel with a lax check-in policy. If the front desk isn’t verifying who’s checking in, anyone could grab a room key and waltz right into the VIP suite, where all the secrets are kept! An attacker could exploit this flaw to gain full access to Envoy's control plane, potentially snatching up TLS private keys and other critical credentials. In the wrong hands, this could lead to disastrous security breaches, allowing unauthorized communication and data compromise. 🚨

Put simply

Think of it like a hotel with a lax check-in policy. If the front desk isn’t verifying who’s checking in, anyone could grab a room key and waltz right into the VIP suite, where all the secrets are kept! This vulnerability in Envoy allows Lua scripts to expose sensitive credentials, which unauthorized users can leverage to access the control plane and its secrets, like an unchecked access policy.

What to do

An attacker could exploit this flaw to gain full access to Envoy's control plane, potentially snatching up TLS private keys and other critical credentials. In the wrong hands, this could lead to disastrous security breaches, allowing unauthorized communication and data compromise. 🚨 Immediately upgrade Envoy to version 1.5.7 or 1.6.2 to mitigate this risk. Review existing Lua scripts for potential leaks and ensure strict validation on access controls. It's crucial to maintain strong security practices in your configurations! You've got this! Stay vigilant and patch up, and you'll help keep our digital kingdom safe! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00622 · 49.1th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-01-12T18:08Z
EPSS history
Timeline
  • 12 JAN 18:08Z
    Envoy Extension Policy lua scripts injection causes arbitrary command execution
    cvelistv5