CVE-2026-31837CWE-200

Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.

High · published March 10, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
52.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
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
EPSS
0.00702 · 52.7th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-03-10T21:57Z
EPSS history
Timeline
  • 10 MAR 21:57Z
    Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
    cvelistv5