CVE-2026-41413

Istio Vulnerable to SSRF via RequestAuthentication jwksUri

CVSS 3.1 5.0 MEDIUMEUVD CVSS 3.1 5.0 CVSS 3.1 · [email protected] · Secondary 5.0 MEDIUMCVSS 3.1 · [email protected] · Primary 7.7 HIGHCVSS_V3 Publisher rating MODERATEFixed by istio.io/istio 0.0.0-20260410004459-189832a289c1osv · severity unknownFixed by istio.io/istio 0.0.0-20260410004459-189832a289c1KEV status unknown

Original advisory

cve-program · CVE-2026-41413

Published

Istio is an open platform to connect, manage, and secure microservices. Prior to versions 1.28.6 and 1.29.2, 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. This issue has been patched in versions 1.28.6 and 1.29.2.

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euvd · EUVD-2026-28315

Published

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nvd · CVE-2026-41413

Published

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osv · GHSA-fgw5-hp8f-xfhc

Published

### 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

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osv · GO-2026-5363

Published

Istio: SSRF via RequestAuthentication jwksUri in istio.io/istio

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

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15 Nov 2026 12:05:56 UTC