CVE-2026-50572

5.9 MEDIUMpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw allows a use-after-free condition in Envoy's HTTP external-authorization client, leading to potential process crashes under production traffic.
Exploitability: Exploitation requires specific conditions where requests are rejected and then processed later, making it moderately difficult but feasible with the right setup.
Blast radius: If exploited, this could lead to service disruptions or crashes in affected Envoy deployments handling high traffic.
Prioritized remediation: Update to Envoy versions 1.36.10, 1.37.6, 1.38.4, or 1.39.1 to mitigate the vulnerability.

use-after-freecrashproxynetwork

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

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

Weaknesses

CWE-416

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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