Announcing Istio 1.5.8

Patch Release

This release fixes the security vulnerability described in our July 9th, 2020 news post.

These release notes describe what’s different between Istio 1.5.8 and Istio 1.5.7.

Security update

  • CVE-2020-15104: When validating TLS certificates, Envoy incorrectly allows wildcards in DNS Subject Alternative Name (SAN) to apply to multiple subdomains. For example, with a SAN of *, Envoy incorrectly allows, when it should only allow


  • Allowed setting to zero (Issue 24722)
  • Improved istioctl validate to disallow unknown fields not included in the Open API specification (Issue 24860)
  • Fixed a bug in Mixer where it would incorrectly return source names when it did lookup by IP.
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