# Envoy vulnerabilities Source: https://junglewise.ai/threats/vendors/envoy Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/vendors/envoy.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 12 vulnerabilities in Envoy: 0 in the last 7 days and 11 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, Envoy AI Gateway MCP session hijacking via missing subject verification, was published on 19 October 2026. 2 vulnerabilities in the last four weeks, down 78% on the four before (9). 2 technologies have a page of their own. ## Counts - Last 7 days: 0 - Last 30 days: 2 - Last 90 days: 11 - All time: 12 (0 critical, 0 exploited in the wild) ## About Envoy Open source proxy and communication bus for cloud-native applications. ## Latest Envoy vulnerabilities - [Envoy AI Gateway MCP session hijacking via missing subject verification](https://junglewise.ai/threats/agent-router-mcp-session-resume-does-not-verify-the-embedded-anti-4b0a70ec) (medium, CVSS 4, published 19 Oct 2026) - [Istio and Envoy Proxy security vulnerabilities](https://junglewise.ai/threats/gcp-2026-069-6d8e440c) (info, published 19 Oct 2026) - [CVE-2026-73553: Envoy authorization bypass via path parameter inconsistency](https://junglewise.ai/threats/cve-2026-73553-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73551: Envoy path normalization bypass with semicolon parameters](https://junglewise.ai/threats/cve-2026-73551-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.3, published 21 Sep 2026) - [CVE-2026-73552: Envoy HTTP RBAC bypass via unsafe regex in headers](https://junglewise.ai/threats/cve-2026-73552-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73550: Envoy HTTP/2 Host header denial of service](https://junglewise.ai/threats/cve-2026-73550-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73549: Envoy scoped IPv6 address parsing denial of service](https://junglewise.ai/threats/cve-2026-73549-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.3, published 21 Sep 2026) - [CVE-2026-73547: Envoy null pointer dereference in ext_authz filter](https://junglewise.ai/threats/cve-2026-73547-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73513: Envoy Proxy multiple vulnerabilities](https://junglewise.ai/threats/cve-2026-73513-envoy-proxy-multiple-vulnerabilities) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73512: Envoy heap-use-after-free in HttpDatagramHandler](https://junglewise.ai/threats/cve-2026-73512-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-50572: Envoy use-after-free in HTTP external-authorization client](https://junglewise.ai/threats/cve-2026-50572-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.9, published 21 Sep 2026) - [Envoy Proxy QPACK decoding denial-of-service in HTTP/3](https://junglewise.ai/threats/envoy-proxy-qpack-decoding-denial-of-service-in-http-3-95f03635) (info, published 29 Jun 2026) ## Most severe Envoy vulnerabilities - [CVE-2026-73550: Envoy HTTP/2 Host header denial of service](https://junglewise.ai/threats/cve-2026-73550-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73547: Envoy null pointer dereference in ext_authz filter](https://junglewise.ai/threats/cve-2026-73547-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73512: Envoy heap-use-after-free in HttpDatagramHandler](https://junglewise.ai/threats/cve-2026-73512-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73513: Envoy Proxy multiple vulnerabilities](https://junglewise.ai/threats/cve-2026-73513-envoy-proxy-multiple-vulnerabilities) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73552: Envoy HTTP RBAC bypass via unsafe regex in headers](https://junglewise.ai/threats/cve-2026-73552-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-73553: Envoy authorization bypass via path parameter inconsistency](https://junglewise.ai/threats/cve-2026-73553-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (high, CVSS 7.5, published 21 Sep 2026) - [CVE-2026-50572: Envoy use-after-free in HTTP external-authorization client](https://junglewise.ai/threats/cve-2026-50572-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.9, published 21 Sep 2026) - [CVE-2026-73549: Envoy scoped IPv6 address parsing denial of service](https://junglewise.ai/threats/cve-2026-73549-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.3, published 21 Sep 2026) - [CVE-2026-73551: Envoy path normalization bypass with semicolon parameters](https://junglewise.ai/threats/cve-2026-73551-envoy-is-an-open-source-edge-and-service-proxy-designed-for-cloud) (medium, CVSS 5.3, published 21 Sep 2026) - [Envoy AI Gateway MCP session hijacking via missing subject verification](https://junglewise.ai/threats/agent-router-mcp-session-resume-does-not-verify-the-embedded-anti-4b0a70ec) (medium, CVSS 4, published 19 Oct 2026) ## Vulnerabilities per week 2 vulnerabilities in the last four weeks, down 78% on the four before (9). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 9 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 2 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Envoy technologies - [Envoy](https://junglewise.ai/threats/technologies/envoy-envoy): 8 vulnerabilities - [Envoy Proxy](https://junglewise.ai/threats/technologies/envoy-proxy): 3 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Envoy vulnerabilities", https://junglewise.ai/threats/vendors/envoy, 9 November 2026.