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

Quick assessment

Affected
istio istio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Istio是Istio开源的一套连接、管理和保护微服务的开放平台。 Istio 1.29.1之前版本、1.28.5之前版本和1.27.8之前版本存在信息泄露漏洞，该漏洞源于JWKS解析器不可用或获取失败时暴露硬编码默认值，可能导致安全配置失效。

AI Predicted 9.1 Difficulty: Easy EPSS 0.39% · P33

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 3

VendorProduct Version RangeStatus
istio istio >= 1.29.0-alpha.0, < 1.29.1 affected
>= 1.28.0-alpha.0, < 1.28.5 affected
< 1.27.8 affected
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I. Basic Information for CVE-2026-31837

Vulnerability Information
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Vulnerability Title
Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Istio 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Istio是Istio开源的一套连接、管理和保护微服务的开放平台。 Istio 1.29.1之前版本、1.28.5之前版本和1.27.8之前版本存在信息泄露漏洞，该漏洞源于JWKS解析器不可用或获取失败时暴露硬编码默认值，可能导致安全配置失效。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
istio istio >= 1.29.0-alpha.0, < 1.29.1 -

II. Public POCs for CVE-2026-31837

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III. Intelligence Information for CVE-2026-31837

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Vendor Advisories for CVE-2026-31837 (1)

IV. Related Vulnerabilities

Same product: istio
Same vendor: istio
Same weakness: CWE-200