# CVE-2026-39350

> Vulnerability · severity: **MEDIUM** (CVSS 5.4).

## 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.

## Key facts

- **CVE ID:** CVE-2026-39350
- **Published:** 2026-04-15
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.4
- **CWE codes:** CWE-185, CWE-863

## Affected products

- `istio:istio`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39350

## Citation

> AI Analytics. CVE-2026-39350. Retrieved 2026-08-10 from https://api.ai-analytics.org/cve/CVE-2026-39350. Derived from NIST NVD. Licensed CC0.

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