CVE-2026-55771: Cedar java Cedar-Java Has Policy Injection, Type Vulnerability
HIGHCVE-2026-55771 is a HIGH (CVSS 8.8) cedar-java has policy injection, type vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Cedar java libraries in the Maven ecosystem. The issue involves cedar-java has policy injection, type confusion, and incorrect equality comparison vulnerabilities. Remediation is available by upgrading affected packages to version 2.3.6, 3.4.1, 4.9.0.
CVE-2026-55771 at a Glance
Security Impact
CVSS: 8.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-55771
To remediate this vulnerability, upgrade all affected Cedar java dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>com.cedarpolicy</groupId>
<artifactId>cedar-java</artifactId>
<version>2.3.6</version>
</dependency><dependency>
<groupId>com.cedarpolicy</groupId>
<artifactId>cedar-java</artifactId>
<version>3.4.1</version>
</dependency><dependency>
<groupId>com.cedarpolicy</groupId>
<artifactId>cedar-java</artifactId>
<version>4.9.0</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=com.cedarpolicyHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2026-55771, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=com.cedarpolicyAnalyze the terminal output to locate any version of Cedar java in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.6), your application is affected.
Note: The mvn dependency:tree -Dincludes=com.cedarpolicy command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Cedar java, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-55771 Affected Cedar java Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
com.cedarpolicy:cedar-java
|
Maven |
< 2.3.6
|
2.3.6
|
|
com.cedarpolicy:cedar-java
|
Maven |
≥ 3.1.2
< 3.4.1
|
3.4.1
|
|
com.cedarpolicy:cedar-java
|
Maven |
≥ 4.0.0
< 4.9.0
|
4.9.0
|
References
Frequently Asked Questions
What is CVE-2026-55771?
Which Cedar java versions are affected?
What version fixes CVE-2026-55771?
Is cedar-java affected?
What is the CVSS score of CVE-2026-55771?
What CWE is associated with CVE-2026-55771?
How can I check Maven dependencies for CVE-2026-55771?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-4r9r-4425-74p7",
"modified" : "2026-07-28T14:50:25Z",
"published" : "2026-07-28T14:50:25Z",
"aliases" : [ "CVE-2026-55771" ],
"summary" : "Cedar-Java has policy injection, type confusion, and incorrect equality comparison vulnerabilities",
"details" : "### Summary\n\nCedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. Under certain circumstances, it could lead to incorrect equality comparisons.\n\n### Impact\n\n**`EntityIdentifier.equals()` has inverted null/self branches**\n\nThe `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.\n\n### Impacted versions: \n< 4.9\n\n### Patches\nIt has been addressed in CedarJava version 4.9 and above. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.\n\n### Workarounds\nAvoid relying on `EntityIdentifier.equals()` for security-sensitive comparisons until upgraded to version `4.9`.\n\n### References\nIf you have any questions or comments about this advisory, Cedar asks that you contact us directly via email to [cedar-policy-security@lists.cncf.io](mailto:cedar-policy-security@lists.cncf.io). Please do not create a public GitHub issue.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "com.cedarpolicy:cedar-java"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.3.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "com.cedarpolicy:cedar-java"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.1.2"
}, {
"fixed" : "3.4.1"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "com.cedarpolicy:cedar-java"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.0.0"
}, {
"fixed" : "4.9.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/cedar-policy/cedar-java/security/advisories/GHSA-4r9r-4425-74p7"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55771"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/cedar-policy/cedar-java"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-697", "CWE-843", "CWE-94" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-28T14:50:25Z",
"nvd_published_at" : "2026-07-13T20:16:48Z"
}
}