---
cve: "CVE-2026-50572"
severity: "MEDIUM"
cvss: 5.9
epss: "6.6%"
vendor: "envoyproxy"
kev: false
exploited: false
published: "2026-09-21 20:17:25"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T13:42:49+02:00"
---

# CVE-2026-50572

> 5.9 MEDIUM · 🧪 PoC

## Beschreibung

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's HTTP external-authorization client can retain a stale request callback after a request is rejected. When RawHttpClientImpl::onSuccess later processes the authorization response, it can invoke callbacks_ after the callback owner has been destroyed, causing a use-after-free and process crash under production traffic. The relevant scope boundary is that the vulnerable path uses the HTTP ext_authz client; the advisory does not establish the same trigger for unrelated filters. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv>
- <https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b33db8>
- <https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849d7ce>
- <https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de000310165f03>
- <https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e2cfb>
- <https://github.com/envoyproxy/envoy/releases/tag/v1.36.10>
- <https://github.com/envoyproxy/envoy/releases/tag/v1.37.6>
- <https://github.com/envoyproxy/envoy/releases/tag/v1.38.4>
- <https://github.com/envoyproxy/envoy/releases/tag/v1.39.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-50572) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_