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CVE-2026-39350— Istio AuthorizationPolicy Incorrect Regex Matching of Dots in serviceAccounts Fields Allows Policy Bypass

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 1.27.9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。

CVSS 5.4 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
istio istio >= 1.25.0, < < 1.27.9 -

II. Public POCs for CVE-2026-39350

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III. Intelligence Information for CVE-2026-39350

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IV. Related Vulnerabilities

Same product: istio
Same vendor: istio
Same weakness: CWE-185