# CVE-2026-50572: Envoy: ext_authz - RawHttpClientImpl onSuccess 0x0 segfault

> CVE-2026-50572: Envoy: ext_authz - RawHttpClientImpl onSuccess 0x0 segfault. CVSS 5.9 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-50572
Last updated: 2026-10-05T14:12:02Z

- Published: 2026-09-21 19:32 UTC · Updated: 2026-10-05 14:12 UTC · Assigner: GitHub\_M
- CVSS: 5.9 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.68%, 52th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-416

## Description

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.

## Affected vendors and products

- envoyproxy: envoy

## Tracked companies

- [Google Cloud](https://rewindex.com/company/google-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-50572)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-50572)
- [https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b33db8](https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b33db8)
- [https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849d7ce](https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849d7ce)
- [https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de000310165f03](https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de000310165f03)
- [https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e2cfb](https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e2cfb)
- [https://github.com/envoyproxy/envoy/releases/tag/v1.36.10](https://github.com/envoyproxy/envoy/releases/tag/v1.36.10)
- [https://github.com/envoyproxy/envoy/releases/tag/v1.37.6](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/v1.38.4)
- [https://github.com/envoyproxy/envoy/releases/tag/v1.39.1](https://github.com/envoyproxy/envoy/releases/tag/v1.39.1)
- [https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv](https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-50572 · Markdown: https://rewindex.com/cve/CVE-2026-50572.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-50572 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:13:21.146Z