high7.5
CVE-2026-31837
Istio is an open platform to connect, manage, and secure microservices.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Istio | Istio | before 1.27.8 from 1.28.0 before 1.28.5 from 1.29.0 before 1.29.1 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c
- 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