Description
Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., something/../admin, to bypass access control, e.g., a block on /admin. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Service Mesh 0 | servicemesh-proxy | 0.9.1-1.el7 | RHSA-2019:0741 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/envoyproxy/envoy | < 1.9.1 | 1.9.1 | GHSA-2wmf-p7f8-w42h |
Advisories 1
- RHSA-2019:0741 Red Hat Security Advisory: Istio-Proxy Security Update Red Hat Security Advisories (RHSA) · Mar 18, 2026