Vulnerability record · CVE-2026-31837 · published 10 March 2026

CVE-2026-31837: Istio information exposure vulnerability

Istio · Istio

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.

8.7 CVSS 4.0 High EPSS 0.68% · top 49.7% CWE-200 · Information exposureCWE-1392 · CWE-1392

8.7CVSS 4.0 base score

0.68%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

8References

20 Jul 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Istio Istio

References

Link	Tags
https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c	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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-31837), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.