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CVE-2026-50572

Envoy: ext_authz - RawHttpClientImpl onSuccess 0x0 segfault

MEDIUM
5.9
CVSS Score
Published: September 21, 2026 at 07:32 PM UTC
Updated: October 5, 2026 at 02:12 PM UTC
1 product affected across 1 vendorEnvoy

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Envoy· Envoyproxy
95%
v < 1.36.10v < 1.37.6v < 1.38.4v < 1.39.11.37.0 ≤ v < 1.37.61.38.0 ≤ v < 1.38.41.39.0 ≤ v < 1.39.1
Affected range stops below 1.36.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.37.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.38.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.39.1, so it looks safe — our inference, not a vendor statement

References (9)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv
x_refsource_MISCPatch
Source: cverecord
https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b33db8
x_refsource_MISCPatch
Source: cverecord
https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849d7ce
x_refsource_MISCPatch
Source: cverecord
https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de000310165f03
x_refsource_MISCPatch
Source: cverecord
https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e2cfb
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/envoyproxy/envoy/releases/tag/v1.36.10
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/envoyproxy/envoy/releases/tag/v1.37.6
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/envoyproxy/envoy/releases/tag/v1.38.4

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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