# Envoy Proxy Releases v1.39.4 with Bug Fixes

> **Key takeaway:** Envoy Proxy released version v1.39.4, which includes several bug fixes for issues related to route-level configuration and Prometheus metrics.

**Published:** 2026-10-12T22:22:37+00:00 
**Source:** Envoy Cloud-Native Edge Proxy 
**Category:** cloud-native 
**Canonical URL:** https://fosswire.org/news/envoy-proxy-releases-v1394-with-bug-fixes.html 

## Summary
The Envoy Proxy project has released version v1.39.4, which addresses several bugs related to route-level configuration and metrics. The fixes include issues with AWS request signing, composite filters, and Prometheus native histogram bucket indices. This release is expected to improve the stability and accuracy of Envoy Proxy for its users.

## Bug Fixes in Envoy Proxy v1.39.4
- **aws**: Fixed a race condition where the route-level configuration of the AWS request signing and AWS Lambda filters could be destroyed on a worker thread when an RDS update replaced the route configuration.
- **composite**: Fixed a race condition where the route-level configuration of the composite filter could be destroyed on a worker thread when an RDS update replaced the route configuration.
- **stats**: Fixed a bug introduced in 1.38.0 that exported Prometheus native histogram bucket indices one bucket too low, causing consumers to decode observations into lower value ranges and underreport quantiles.

## Why it matters
This release is expected to improve the stability and accuracy of Envoy Proxy for its users, particularly those relying on AWS and Prometheus integrations.