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Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity information exposure in istio from istio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.4%top 61.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 (as reported)

VendorProductVersions
istio istio >= 1.29.0-alpha.0, < 1.29.1>= 1.28.0-alpha.0, < 1.28.5< 1.27.8

Weakness: CWE-200, CWE-1392 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References