CVE-2026-31837 HIGH

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

Vendor Istio
Product istio
Weakness CWE-200 · Info exposure
Published March 10, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 10, 2026 CVE published
June 30, 2026 Record updated