Access of Resource Using Incompatible Type ('Type Confusion') Affecting com.cedarpolicy:cedar-java package, versions [,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.
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Test your applications- Snyk IDSNYK-JAVA-COMCEDARPOLICY-18601848
- published10 Aug 2026
- disclosed28 Jul 2026
- creditUnknown
Introduced: 28 Jul 2026
CVE-2026-55771 (opens in a new tab)How to fix?
Upgrade com.cedarpolicy:cedar-java to version 4.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type ('Type Confusion') via the EntityIdentifier.equals() method in CedarJava/src/main/java/com/cedarpolicy/value/EntityIdentifier.java. An attacker can trigger incorrect identity checks by supplying an EntityIdentifier that is compared against null or the same instance, causing code that relies on equals() to treat null as equal and self-comparisons as unequal. This can break application-level authorization or deduplication logic that uses EntityIdentifier objects, leading to unauthorized access decisions or rejected valid identifiers in integrator code.
Workarounds
- Avoid relying on
EntityIdentifier.equals()for security-sensitive comparisons until you upgrade to CedarJava4.9or later. This prevents incorrect allow/deny or deduplication decisions caused by the inverted null/self comparison behavior.