PatchSiren cyber security CVE debrief

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: 2026-07-15
Advisory published: 2026-01-12
Advisory updated: 2026-07-15

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.

Sources and references

Verified primary and authoritative sources

CVE-2026-22771 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-22771

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-22771 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-22771

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Mitigation or vendor reference
Unverified legacy reference

URL: https://github.com/envoyproxy/gateway/security/advisories/GHSA-xrwg-mqj6-6m22

[email protected] - Exploit, Mitigation, Vendor Advisory
Source reference
Unverified legacy reference

URL: https://access.redhat.com/security/cve/CVE-2026-22771

0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Source reference
Unverified legacy reference

URL: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-22771.json

0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.