High 8.7Published Mar 10, 2026

CVE-2026-31837Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.

Updated under an hour ago (Oct 28, 2026, 12:10 AM ET)

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It affects istio and 7 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for istio

Exploited in the last 30 days

Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a user of Istio is impacted if the JWKS resolver becomes unavailable or the fetch fails, exposing hardcoded defaults regardless of use of the RequestAuthentication resource. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-200, CWE-1392
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

istio istio istio:istio (from the name)	from 1.29.0-alpha.0, < 1.29.1; from 1.28.0-alpha.0, < 1.28.5; before 1.27.8	CNA record
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1776343082 not affected	CISA ADP
Red Hat Red Hat OpenShift Service Mesh 3.0 redhat:service_mesh	from 1774006090 not affected	CISA ADP
Red Hat cert-manager Operator for Red Hat OpenShift redhat:cert_manager	1	CISA ADP
Red Hat ExternalDNS Operator redhat:ext_dns_optr	1	CISA ADP
Red Hat OpenShift Serverless redhat:serverless	1	CISA ADP
Red Hat Red Hat Ansible Automation Platform 2 redhat:ansible_automation_platform	2	CISA ADP
Red Hat Red Hat Connectivity Link 1 redhat:connectivity_link	1	CISA ADP
istio istio istio:istio	before 1.27.8; from 1.28.0 before 1.28.5; from 1.29.0 before 1.29.1	NVD

References

References

https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c	x-refsource-confirm, vendor-advisory
https://access.redhat.com/errata/RHSA-2026:10184
https://access.redhat.com/errata/RHSA-2026:5948
https://access.redhat.com/errata/RHSA-2026:5950
https://access.redhat.com/errata/RHSA-2026:5952
https://access.redhat.com/security/cve/CVE-2026-31837
https://bugzilla.redhat.com/show_bug.cgi?id=2446344
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31837.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.