CVE-2026-39350
MEDIUM5.4EPSS 0.01%Istio: AuthorizationPolicy serviceAccounts regex injection via unescaped dots
Published: 4/16/2026Modified: 4/18/2026
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
Affected packages (1)
- Go/istio.io/istio>= 0.0.0-20241024090207-0bf27d49ba4b, < 0.0.0-20260403004500-692e460c342d
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |