envoyproxy/gateway

SDS: support listener certificates

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#9,009 opened on May 15, 2026

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help wanted

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Description

Question: Why are SDS Secrets only supported for backend TLS? It seems reasonable to also support them for listener certificates, since Envoy can fetch listener certs via SDS.

Originally posted by @zhaohuabing in https://github.com/envoyproxy/gateway/issues/8983#issuecomment-4457786557

Contributor guide

Research direction
Examine how SDS secrets are currently used for backend TLS and replicate pattern for listener certificates. Check Envoy SDS configuration and the gateway's secret resolution logic.
Tech stack
go
Domain
backendinfrastructure
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoEnvoy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65