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Security Advisories

CVE-2026-39350

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-39350

Severity

5.4

Medium

CVSS V3

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Summary

Istio AuthorizationPolicy Incorrect Regex Matching of Dots in serviceAccounts Fields Allows Policy Bypass

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-39350
  • https://github.com/advisories/GHSA-9gcg-w975-3rjh
  • https://pkg.go.dev/vuln/GO-2026-5289
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39350.json
  • https://github.com/istio/istio/security/advisories/GHSA-9gcg-w975-3rjh

Affected packages

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