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CVE-2026-73547— Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_pa

CVSS 7.5 · High EPSS 0.83% · P56

Affected Version Matrix 4

VendorProduct Version RangeStatus
envoyproxy envoy < 1.36.10 affected
>= 1.37.0, < 1.37.6 affected
>= 1.38.0, < 1.38.4 affected
>= 1.39.0, < 1.39.1 affected
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I. Basic Information for CVE-2026-73547

Vulnerability Information

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Vulnerability Title
Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check
Source: CVE Program / CVE List V5
Vulnerability 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 ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_parameters_to_remove from an authorization response. A path-less CONNECT request makes request_headers_->Path() return null, and Filter::onComplete dereferences that pointer while parsing the query string. An unauthenticated downstream client can crash the Envoy process when the filter and authorization response use query-parameter mutation. The relevant scope boundary is that the deployment must accept path-less CONNECT and configure ext_authz query-parameter mutation. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy < 1.36.10 -

II. Public POCs for CVE-2026-73547

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III. Intelligence Information for CVE-2026-73547

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Patches & Fixes for CVE-2026-73547 (4)

Other References for CVE-2026-73547 (5)

Same Patch Batch · envoyproxy · 2026-09-21 · 13 CVEs total

CVE-2026-73550 7.5 HIGH Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy
CVE-2026-73512 7.5 HIGH Envoy: use-after-free in QUIC on internal redirects
CVE-2026-73553 7.5 HIGH Envoy: RBAC Authorization Bypass via Path Parameters
CVE-2026-73513 7.5 HIGH Envoy: oghttp2 upstream trailers incorrect handling
CVE-2026-73548 7.5 HIGH Envoy: Cross-user response poisoning via a generic (non-WebSocket) HTTP upgrade on Envoy's
CVE-2026-73552 7.5 HIGH Envoy: HTTP RBAC safe_regex can fail open on RFC-valid obs-text header values
CVE-2026-73546 7.4 HIGH Envoy: Stored XSS in Admin Stats Interface (/stats?format=html)
CVE-2026-48521 5.9 MEDIUM Envoy: HTTP/3 connection pool selection null-derefs in ProdClusterManagerFactory::allocate
CVE-2026-50572 5.9 MEDIUM Envoy: ext_authz - RawHttpClientImpl onSuccess 0x0 segfault
CVE-2026-73511 5.3 MEDIUM Envoy: Potential path-matching/authentication bypass when using Envoy in combination with
CVE-2026-73549 5.3 MEDIUM Envoy - Incomplete fix for CVE-2026-26310: copyInternetAddressAndPort crashes on scoped IP
CVE-2026-73551 5.3 MEDIUM Envoy: Path normalization does not handle dot and dotdot segments with parameters

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-20

V. Comments for CVE-2026-73547

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