GitHub Advisoryadvisory · Go

GHSA-fgw5-hp8f-xfhc Istio: SSRF via RequestAuthentication jwksUri

MEDIUM Published 2026-04-16 Modified 2026-05-08 Official page ↗
Aliases
CVE-2026-41413
Ecosystem
Go
Packages
istio.io/istio
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Weaknesses
CWE-918
Reviewed
2026-04-16

Affected packages

• Go istio.io/istio: < 0.0.0-20260410004459-189832a289c1 → fixed in 0.0.0-20260410004459-189832a289c1

Description

Impact When a RequestAuthentication resource is created with a jwksUri pointing to an internal service, istiod makes an unauthenticated HTTP GET request to that URL without filtering out localhost or link local ips. This can result in sensitive data being distributed to Envoy proxies via xDS configuration. Note: a partial mitigation for this was released in 1.29.1, 128.5, and 1.27.8; however, it was incomplete and missed a few codepaths. 1.29.2 and 1.28.6 contain the more robust fix. Patches _Has the problem been patched? What versions should users upgrade to?_ Workarounds Users can deploy a `ValidatingAdmissionPolicy` to prevent the creation of `RequestAuthentication` resources with suspicious jwksUri field values (e.g. localhost, 127.0.0.0/8, 169.254.0.0/16, the ipv6 variants, etc.). References None

Related

Alias · CVE (1)

  • CVE-2026-41413 Istio is an open platform to connect, manage, and secure microservices. vulnerability

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References