envoyproxy/envoy

SPIFFE validator + "mtls_authenticated" do not support session resumption

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#42,668 opened on Dec 17, 2025

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area/tlsbughelp wanted

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Description

On a resumed session, "peer certificate validated" is set to false since that bit is cert by the validator flow per connection. That means any policy using mtls_authenticated evaluates to false, and can be dangerous if used as a DENY policy. The workaround is to disable session resumption in TLS.

Contributor guide

Research direction
Investigate how the SPIFFE validator sets the 'peer certificate validated' flag during TLS session resumption in Envoy. Trace the code path to ensure the flag is set correctly on resumed sessions.
Tech stack
cpp
Domain
backendsecurity
Issue type
Bug
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.
1-2 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
C++TLSSPIFFEEnvoy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35