CVE-2026-31837
Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
CVSS Score
7.5
EPSS Score
0.4%
EPSS Percentile
30th
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.
| CWE | CWE-200 |
| Vendor | istio |
| Product | istio |
| Published | Mar 10, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
istio / istio
>= 1.29.0-alpha.0, < 1.29.1 >= 1.28.0-alpha.0, < 1.28.5 < 1.27.8
References
github.com: https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-31837 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2446344 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31837.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10184 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:5950 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:5952 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:5948