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CVE-2026-22771 Envoyproxy CVE debrief

CVE-2026-22771 is a high-severity vulnerability in Envoy Gateway, a project for managing Envoy Proxy. The vulnerability allows EnvoyExtensionPolicy Lua scripts executed by Envoy proxy to leak the proxy's credentials. These credentials can be used to communicate with the control plane and gain access to all secrets used by Envoy proxy, including TLS private keys and credentials for downstream and upstream communication. The vulnerability is fixed in versions 1.5.7 and 1.6.2. This issue highlights the importance of securing proxy credentials and limiting the execution of untrusted Lua scripts.

Vendor
Envoyproxy
Product
Gateway
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-12
Original CVE updated
2026-06-30
Advisory published
2026-01-12
Advisory updated
2026-06-30

Who should care

Security teams and administrators responsible for Envoy Gateway deployments should prioritize patching this vulnerability. The leak of proxy credentials can lead to significant security breaches, including unauthorized access to sensitive data and potential lateral movement within the network. Organizations using Envoy Gateway should assess their exposure and apply the necessary patches.

Technical summary

CVE-2026-22771 is a high-severity vulnerability in Envoy Gateway, with a CVSS score of 8.8. The vulnerability exists in the EnvoyExtensionPolicy Lua scripts executed by Envoy proxy, which can be exploited to leak proxy credentials. This can allow an attacker to communicate with the control plane and access secrets used by Envoy proxy. The vulnerability is characterized by CWE-94, indicating an issue with code injection. The affected versions of Envoy Gateway are prior to 1.5.7 and 1.6.2.

Defensive priority

High priority should be given to patching CVE-2026-22771 in Envoy Gateway deployments. Immediate action is recommended to prevent potential credential leaks and unauthorized access.

Recommended defensive actions

  • Apply patches: Upgrade to Envoy Gateway version 1.5.7 or 1.6.2 to fix the vulnerability.
  • Review Lua scripts: Ensure that all Lua scripts executed by Envoy proxy are reviewed and validated to prevent code injection attacks.
  • Monitor for suspicious activity: Implement monitoring to detect any suspicious communication with the control plane or access to sensitive secrets.
  • Limit proxy credentials: Implement strict access controls and limit the exposure of proxy credentials.
  • Perform inventory checks: Verify that all Envoy Gateway deployments are up-to-date and not vulnerable.

Evidence notes

The CVE-2026-22771 vulnerability was publicly disclosed on January 12, 2026, and last modified on June 30, 2026. The vulnerability affects Envoy Gateway versions prior to 1.5.7 and 1.6.2. The CVSS score of 8.8 indicates a high-severity issue. The CWE-94 weakness indicates a code injection vulnerability.

Official resources

This article is AI-assisted and based on the supplied source corpus.