# Istio 1.31.0 — Istio 1.31.0

- Product: Istio (https://whatsnew.fyi/product/istio)
- Vendor: Istio
- Date: 2026-08-31
- Version: 1.31.0
- Original notes: https://github.com/istio/istio/releases/tag/1.31.0
- Permalink: https://whatsnew.fyi/product/istio/releases/1.31.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **added** — Add support for per-route timeout configuration through DestinationRule
- **added** — Add support for configuring mutual TLS mode per service account namespace pair
- **added** — Add telemetry API for customizing metric labels and attributes
- **added** — Add WasmPlugin resource for extending Istio with WebAssembly modules
- **changed** — Improve performance of Envoy configuration generation for large clusters
- **changed** — Upgrade envoy to version 1.32.0
- **changed** — Improve error messages for common configuration mistakes
- **fixed** — Fix incorrect routing when using VirtualService with TCP protocol
- **fixed** — Fix memory leak in Pilot when handling large numbers of services
- **fixed** — Fix race condition in certificate rotation for mTLS
- **deprecated** — Deprecate MeshPolicy in favor of PeerAuthentication

[Artifacts](http://gcsweb.istio.io/gcs/istio-release/releases/1.31.0/)
[Release Notes](https://istio.io/news/releases/1.31.x/announcing-1.31/)