Improper Neutralization Affecting istio.io/istio/pilot/pkg/security/authz/model package, versions >=1.25.0-rc.0 <1.27.9>=1.28.0-alpha.0 <1.28.6>=1.29.0-alpha.0 <1.29.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-ISTIOIOISTIOPILOTPKGSECURITYAUTHZMODEL-16082534
- published16 Apr 2026
- disclosed16 Apr 2026
- creditWernerina
Introduced: 16 Apr 2026
CVE-2026-39350 (opens in a new tab)How to fix?
Upgrade istio.io/istio/pilot/pkg/security/authz/model to version 1.27.9, 1.28.6, 1.29.2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Neutralization due to the serviceAccountRegex matcher in pilot/pkg/security/authz/model/generator.go. An attacker can gain access to workloads protected by AuthorizationPolicy rules by presenting a SPIFFE identity whose namespace or service account name match regex metacharacters, causing the generated matcher to treat those characters as pattern syntax instead of literal text. This allows identities with crafted names to match policies intended for different service accounts, resulting in the acceptance of unauthorized requests and access to protected services.