Is CVE-2026-39350 actively exploited?

CVE-2026-39350 has no public evidence of in-the-wild exploitation as of 2026-04-23.

What is the CVSS score for CVE-2026-39350?

CVE-2026-39350 has a CVSS score of 5.4 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

How do I patch CVE-2026-39350?

Patch guidance is available from istio security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-39350.

Which products are affected by CVE-2026-39350?

3 products: istio istio, istio istio, istio istio.

CVE-2026-39350 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-185 CWE-863 · Incorrect Authorization

Metadata

Primary Vendor: ISTIO
Published: 4/15/2026
Last Modified: 4/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

istio : istioistio : istioistio : istio

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-39350. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-39350

View on NIST NVD

CVE-2026-39350 vulnerability