Access of Resource Using Incompatible Type ('Type Confusion') Affecting com.cedarpolicy:cedar-java package, versions [,2.3.6)[3.1.2,3.4.1)[4.0.0,4.9.0)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-JAVA-COMCEDARPOLICY-17732794
- published30 Jun 2026
- disclosed19 Jun 2026
- creditUnknown
Introduced: 19 Jun 2026
CVE-2026-55772 (opens in a new tab)How to fix?
Upgrade com.cedarpolicy:cedar-java to version 2.3.6, 3.4.1, 4.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type ('Type Confusion') through improper handling of reserved keys in the JSON protocol when serializing CedarMap. An attacker can cause unauthorized access or manipulation of data by supplying specially crafted keys that are interpreted incorrectly across the Java-Rust FFI boundary. This is only exploitable if the integrating service constructs a CedarMap from attacker-controlled keys and a policy references that value in a when/unless clause.
Workaround
This vulnerability can be mitigated by enabling schema-based request validation and ensuring user-controlled data does not contain reserved keys (__entity or __extn) before building CedarMap objects.