CVE-2026-39350
Published:April 15, 2026
Updated:August 24, 2026
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.
Affected Packages
github.com/patrickhener/goshs (GO):
Affected version(s) >=v2.0.0-beta.4 <v2.0.0-beta.6Fix Suggestion:
Update to version v2.0.0-beta.6istio.io/istio (GO):
Affected version(s) >=v0.0.0-20241024090207-0bf27d49ba4b <v0.0.0-20260403004500-692e460c342dFix Suggestion:
Update to version v0.0.0-20260403004500-692e460c342dRelated Resources (5)
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Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
EPSS
Base Score:
0.21