Dan Tulovsky

**Name of the Vulnerable Software and Affected Versions** Envoy versions prior to 1.26.0 Envoy versions prior to 1.25.3 Envoy versions prior to 1.24.4 Envoy versions prior to 1.23.6 Envoy versions prior to 1.22.9 **Description** The Lua filter in Envoy is vulnerable to denial of service. Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes. As a workaround for those whose Lua filter is buffering all requests/responses, mitigate by using the buffer filter to avoid triggering the local reply in the Lua filter. **Recommendations** For versions prior to 1.26.0, update to version 1.26.0 or later. For versions prior to 1.25.3, update to version 1.25.3 or later. For versions prior to 1.24.4, update to version 1.24.4 or later. For versions prior to 1.23.6, update to version 1.23.6 or later. For versions prior to 1.22.9, update to version 1.22.9 or later. As a temporary workaround, consider using the buffer filter to avoid triggering the local reply in the Lua filter for those whose Lua filter is buffering all requests/responses.