CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NCVE-2026-39350
Medium (5.4) in istio istio. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in istio.io/istio 0.0.0-20260403004500-692e460c342d.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-185, CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- istio:istio
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9gcg-w975-3rjh | Go | istio.io/istio | >=0.0.0-20241024090207-0bf27d49ba4b <0.0.0-20260403004500-692e460c342d | 0.0.0-20260403004500-692e460c342d |
| GO-2026-5289 | Go | istio.io/istio | >=0.0.0-20241024090207-0bf27d49ba4b <0.0.0-20260403004500-692e460c342d | 0.0.0-20260403004500-692e460c342d |