CVE-2026-31837
8.7
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| istio | istio | >= 1.29.0-alpha.0, < 1.29.1 | affected |
| istio | istio | >= 1.28.0-alpha.0, < 1.28.5 | affected |
| istio | istio | < 1.27.8 | affected |
Weaknesses
- CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: partial
istio: Istio: Information disclosure and authentication bypass via JWKS resolver unavailability
Additional References
- 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
- 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
References
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