CVE-2026-50572: CWE-416: Use After Free in envoyproxy envoy
CVE-2026-50572 is a use-after-free vulnerability in Envoy's HTTP external-authorization client affecting versions prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1. The flaw occurs when a stale request callback is retained after a request rejection, leading to a process crash when the callback is invoked after its owner is destroyed. This issue is specific to the HTTP ext_authz client and does not affect unrelated filters. The vulnerability has a medium severity with a CVSS score of 5.9 and is fixed in the specified versions.
AI Analysis
Technical Summary
Envoyproxy's Envoy versions before 1.36.10, 1.37.6, 1.38.4, and 1.39.1 contain a use-after-free vulnerability (CWE-416) in the HTTP external-authorization client. When a request is rejected, the client may retain a stale callback reference. Later, when processing the authorization response, the client invokes this callback after its owner object has been destroyed, causing a use-after-free condition that leads to a process crash. This vulnerability is limited to the HTTP ext_authz client path and does not affect other filters. The issue is resolved by updating to the fixed versions.
Potential Impact
The vulnerability can cause a denial of service by crashing the Envoy process under production traffic due to use-after-free memory corruption. There is no impact on confidentiality or integrity reported. No known exploits are currently in the wild.
Mitigation Recommendations
This vulnerability is fixed in Envoy versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1. Users should upgrade to these or later versions to remediate the issue. No other mitigation or workaround is indicated.
CVE-2026-50572: CWE-416: Use After Free in envoyproxy envoy
Description
CVE-2026-50572 is a use-after-free vulnerability in Envoy's HTTP external-authorization client affecting versions prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1. The flaw occurs when a stale request callback is retained after a request rejection, leading to a process crash when the callback is invoked after its owner is destroyed. This issue is specific to the HTTP ext_authz client and does not affect unrelated filters. The vulnerability has a medium severity with a CVSS score of 5.9 and is fixed in the specified versions.
CVSS v3.1
Score 5.9medium
Affected software
envoyproxy
envoy
pkg:github/envoyproxy/envoyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Envoyproxy's Envoy versions before 1.36.10, 1.37.6, 1.38.4, and 1.39.1 contain a use-after-free vulnerability (CWE-416) in the HTTP external-authorization client. When a request is rejected, the client may retain a stale callback reference. Later, when processing the authorization response, the client invokes this callback after its owner object has been destroyed, causing a use-after-free condition that leads to a process crash. This vulnerability is limited to the HTTP ext_authz client path and does not affect other filters. The issue is resolved by updating to the fixed versions.
Potential Impact
The vulnerability can cause a denial of service by crashing the Envoy process under production traffic due to use-after-free memory corruption. There is no impact on confidentiality or integrity reported. No known exploits are currently in the wild.
Mitigation Recommendations
This vulnerability is fixed in Envoy versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1. Users should upgrade to these or later versions to remediate the issue. No other mitigation or workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-04T21:34:34.427Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab189c655bf5e2cf56100ee
Added to database: 09/21/2026, 19:47:18 UTC
Last enriched: 09/21/2026, 20:01:47 UTC
Last updated: 09/21/2026, 20:18:38 UTC
Views: 5
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