Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- Informational severity, published 12 October 2026.
- Which products and versions are affected?
- Envoy Proxy Envoy Proxy.
- Is there a fix for This vulnerability?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is This vulnerability attacked?
- It is attacked over the network, in a hosted service.
- Am I affected?
- Check whether you run Envoy Proxy or Google Cloud Platform. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A DoS vulnerability exists in Envoy Proxy when an HTTP filter such as ext_proc with route_cache_action: RETAIN mutates the :path header after route selection on a route configured with prefix_rewrite. The vulnerability requires network access and specific filter configuration. Exploitation causes denial of service.
Affected products
- Envoy Proxy Envoy Proxy
Timeline
- 2026-10-12: disclosed