Read the docs
TI-2025-29454 Aliases CVE-2025-46821

Envoy vulnerable to bypass of RBAC uri_template permission

Priority LOW 30CWE-186Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Envoy is a cloud-native edge/middle/service proxy. Prior to versions 1.34.1, 1.33.3, 1.32.6, and 1.31.8, Envoy's URI template matcher incorrectly excludes the `*` character from a set of valid characters in the URI path. As a result URI path containing the `*` character will not match a URI template expressions. This can result in bypass of RBAC rules when configured using the `uri_template` permissions. This vulnerability is fixed in Envoy versions v1.34.1, v1.33.3, v1.32.6, v1.31.8. As a workaround, configure additional RBAC permissions using `url_path` with `safe_regex` expression.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00279 20th percentileScored 2026-11-07
Fix Fixed envoy (envoyproxy): 1.31.8, 1.32.6, 1.33.3 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
envoyproxyenvoybefore 1.31.8; 1.32.0 to before 1.32.6; 1.33.0 to before 1.33.3; 1.34.0 to before 1.34.11.31.8, 1.32.6, 1.33.3, 1.34.1Patch availableCNA
  • envoy Vendorenvoyproxy Affected before 1.31.8; 1.32.0 to before 1.32.6; 1.33.0 to before 1.33.3; 1.34.0 to before 1.34.1 Fixed in 1.31.8, 1.32.6, 1.33.3, 1.34.1 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*before 1.31.8; 1.32.0 to before 1.32.6; 1.33.0 to before 1.33.3Vulnerableenvoyproxy
cpe:2.3:a:envoyproxy:envoy:1.34.0:*:*:*:*:*:*:*1.34.0Vulnerableenvoyproxy
  • cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions before 1.31.8; 1.32.0 to before 1.32.6; 1.33.0 to before 1.33.3 Vulnerable ·envoyproxy
  • cpe:2.3:a:envoyproxy:envoy:1.34.0:*:*:*:*:*:*:* Versions 1.34.0 Vulnerable ·envoyproxy

Remediation

  • Fix · CNA envoy (envoyproxy) Fixed in 1.31.8, 1.32.6, 1.33.3, 1.34.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-46821

References

Advisory 1

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-20001 HTTP/2: CPU exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
  • TI-2024-18524 HTTP/2: memory exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
  • TI-2023-12215 Envoy client may fake the header `x-envoy-original-path` CVSS 3.1CRITICAL 9.1
  • TI-2023-18002 Envoy vulnerable to OAuth2 credentials exploit with permanent validity CVSS 3.1CRITICAL 9.8
See all 126 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences