CVE-2026-55771 CedarJava has policy injection, type confusion, and incorrect equality comparison vulnerabilities
Incorrect equality logic in CedarJava entity identifiers may allow integrators to bypass authorization checks if they rely on custom equality comparisons.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55771?
CVE-2026-55771 is a high-severity code injection vulnerability in cedar-policy cedar-java, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. In versions prior to 4.9.0, the EntityIdentifier.equals() has inverted null/self branches which could lead to incorrect equality comparisons. The EntityIdentifier.equals() method has inverted logic for null and self-reference checks, returning true for null comparisons and false for self-comparisons. This does not affect Cedar authorization decisions (computed in Rust from JSON), but could affect integrators who perform their own equality checks on entity identifiers. This issue has been fixed in version 4.9.0.
Which versions are affected by CVE-2026-55771?
6 open source packages ship an affected version, including com.cedarpolicy:cedar-java.
| Package | Affected | Fixed in |
|---|---|---|
com.cedarpolicy:cedar-java Maven | All versions | 2.3.6 |
com.cedarpolicy:cedar-java Maven | All versions | 2.3.6 |
com.cedarpolicy:cedar-java Maven | From 3.1.2 | 3.4.1 |
com.cedarpolicy:cedar-java Maven | From 3.1.2 | 3.4.1 |
com.cedarpolicy:cedar-java Maven | From 4.0.0 | 4.9.0 |
com.cedarpolicy:cedar-java Maven | From 4.0.0 | 4.9.0 |
How do I fix CVE-2026-55771?
Upgrade com.cedarpolicy:cedar-java to a fixed version for your release line: 2.3.6, 3.4.1 or 4.9.0.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-55771 being exploited?
There is no known exploitation of CVE-2026-55771 in the wild and no public exploit code.
Sources
Also known as GHSA-4r9r-4425-74p7.