# Envoy vulnerabilities

Source: https://junglewise.ai/threats/technologies/envoy-envoy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/envoy-envoy.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 8 vulnerabilities in Envoy: 0 in the last 7 days and 8 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-73553, was published on 21 September 2026. Nothing in the last four weeks, down from 8 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 8
- All time: 8 (0 critical, 0 exploited in the wild)

## About Envoy

Cloud-native proxy and communication bus designed for large modern service-oriented architectures.

## Latest Envoy vulnerabilities

- [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-2026-73512: 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)

## 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-2026-73552: 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)

## Vulnerabilities per week

Nothing in the last four weeks, down from 8 vulnerabilities in the four before.

| 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 | 8 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Envoy technologies

- [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/technologies/envoy-envoy, 9 November 2026.