GitHub Advisoryadvisory · Go

GHSA-9gcg-w975-3rjh Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots

MEDIUM Published 2026-04-16 Modified 2026-04-16 Official page ↗
Aliases
CVE-2026-39350
Ecosystem
Go
Packages
istio.io/istio
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-185
Reviewed
2026-04-16

Affected packages

• Go istio.io/istio: >= 0.0.0-20241024090207-0bf27d49ba4b, < 0.0.0-20260403004500-692e460c342d → fixed in 0.0.0-20260403004500-692e460c342d

Description

Impact 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 SA e.g. `cert-manager.io` also matches `cert-manager-io`, `cert-managerXio`, etc. A DENY rule targeting the same name fails to block those variants. Patches Fixes are available in 1.29.2, 1.28.6, and 1.27.9 Workarounds None

Related

Alias · CVE (1)

  • CVE-2026-39350 Istio is an open platform to connect, manage, and secure microservices. vulnerability

Weakness · CWE (1)

  • CWE-185 Incorrect Regular Expression weakness

References