CVE-2026-73511— Envoy: Potential path-matching/authentication bypass when using Envoy in combination with a backend stripping per-segment path (matrix) parameters (e.g. Apache Tomcat)
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 normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters fro
Affected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-73511
Vulnerability Information
Shenlong is analyzing...
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Envoy: Potential path-matching/authentication bypass when using Envoy in combination with a backend stripping per-segment path (matrix) parameters (e.g. Apache Tomcat)
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 normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters from each path segment before resolving the resource. Envoy's ignore_path_parameters_in_path_matching option instead truncates at the first semicolon and still does not match per-segment backend behavior. A remote client can use a parameterized protected segment, or a parameter on an earlier segment, to make Envoy select an unprotected fallback while the backend resolves the protected resource. The relevant scope boundary is that the bypass requires both a path-based Envoy decision and a backend that strips semicolon parameters per segment. 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:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选名称进行的认证绕过
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| envoyproxy | envoy | < 1.36.10 | - |
|
II. Public POCs for CVE-2026-73511
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-73511
请登录查看更多情报信息。
Patches & Fixes for CVE-2026-73511 (4)
-
Page not found · GitHub · GitHub x_refsource_MISC
Other References for CVE-2026-73511 (5)
-
Release v1.38.4 · envoyproxy/envoy · GitHub x_refsource_MISC
-
Release v1.37.6 · envoyproxy/envoy · GitHub x_refsource_MISC
-
Release v1.39.1 · envoyproxy/envoy · GitHub x_refsource_MISC
-
Release v1.36.10 · envoyproxy/envoy · GitHub x_refsource_MISC
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-2026-73547 | 7.5 HIGH | Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check |
| 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-2026-73549 | 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
-
CVE-2026-73553
Envoy: RBAC Authorization Bypass via Path Parameters -
CVE-2026-73551
Envoy: Path normalization does not handle dot and dotdot seg -
CVE-2026-73546
Envoy: Stored XSS in Admin Stats Interface (/stats?format=ht -
CVE-2026-73512
Envoy: use-after-free in QUIC on internal redirects -
CVE-2026-73550
Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM i
Same vendor: envoyproxy
-
CVE-2026-73553
Envoy: RBAC Authorization Bypass via Path Parameters -
CVE-2026-73551
Envoy: Path normalization does not handle dot and dotdot seg -
CVE-2026-73546
Envoy: Stored XSS in Admin Stats Interface (/stats?format=ht -
CVE-2026-73512
Envoy: use-after-free in QUIC on internal redirects -
CVE-2026-73550
Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM i
Same weakness: CWE-289
-
CVE-2026-92579
AVideo through 29.0 Broken Access Control via CSRF Exemption -
CVE-2026-12101
Security vulnerabilities have been addressed in IBM Verify I -
CVE-2026-15980
MyHome Core <= 4.4.5 - Authentication Bypass to Account Take -
CVE-2026-32639
Winter: Broken access control in `Cms\Controllers\Index` all -
CVE-2026-15985
Classified Listing - Mobile Number Verification <= 1.6.0 - U
V. Comments for CVE-2026-73511
No comments yet