CVE-2026-39350— Istio AuthorizationPolicy Incorrect Regex Matching of Dots in serviceAccounts Fields Allows Policy Bypass
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-39350
Vulnerability Information
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Vulnerability Title
Istio AuthorizationPolicy Incorrect Regex Matching of Dots in serviceAccounts Fields Allows Policy Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Istio is an open platform to connect, manage, and secure microservices. In versions 1.25.0 through 1.27.8, 1.28.0 through 1.28.5, 1.29.0, and 1.29.1, the serviceAccounts and notServiceAccounts fields in AuthorizationPolicy incorrectly interpret dots (.) as a regular expression matcher. Because . is a valid character in a service account name, an AuthorizationPolicy ALLOW rule targeting a service account such as cert-manager.io also matches cert-manager-io, cert-managerXio, etc. A DENY rule targeting the same name fails to block those variants. Fixes are available in versions 1.29.2, 1.28.6, and 1.27.9.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
不正确的正则表达式
Source: NVD (National Vulnerability Database)
Vulnerability Title
Istio 安全漏洞
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 1.27.9之前版本、1.28.6之前版本和1.29.2之前版本存在安全漏洞，该漏洞源于AuthorizationPolicy中的serviceAccounts和notServiceAccounts字段错误地将点解释为正则表达式匹配器，可能导致访问控制规则被绕过。
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
II. Public POCs for CVE-2026-39350
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IV. Related Vulnerabilities
Same product: istio
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Same vendor: istio
- CVE-2026-41413
Istio Vulnerable to SSRF via RequestAuthentication jwksUri - CVE-2026-31838
Istio HTTP debug endpoints on port 15014 to enforce namespac - CVE-2026-31837
Istio JWKS resolver to prevent private key material from bei - CVE-2022-39388
Istio may allow identity impersonation if user has localhost - CVE-2022-39278
Istio vulnerable to denial of service attack due to Golang R
Same weakness: CWE-185
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V. Comments for CVE-2026-39350
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