Bug 2512095 (CVE-2026-73511)

Summary: CVE-2026-73511 envoy: envoy: path matching bypass via per-segment parameters not stripped by router
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: kaycoth, security-response-team
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Envoy. A remote attacker can exploit this vulnerability by submitting an HTTP request containing per-segment path parameters separated by semicolons. Due to differences in how Envoy and backend servers process these parameters, path matching rules can become misaligned, potentially allowing an attacker to bypass path-based access controls or authentication mechanisms.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Deadline: 2026-08-26   

Description OSIDB Bzimport 2026-08-06 15:01:46 UTC 
Path matching for paths containing per-segment parameters was incorrect. Envoy and backends that strip matrix parameters could previously select different resources for the same request, potentially bypassing path-based service selection or authentication. The fix applies parameter stripping to each path segment.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N (5.3)

Embargoed until 2026-08-26 13:00 GMT per Envoy upstream disclosure. PSIRTSUPT-21132.