{"cve":"CVE-2026-55772","nvd":{"published":"2026-07-13T19:17:15.183","modified":"2026-10-24T22:10:00.210","status":"Deferred","description":"CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. In versions prior to 2.3.6, 3.4.1 and 4.9.0, under certain circumstances, improper input handling could allow Record-to-Entity type confusion across the Java-Rust FFI boundary. CedarJava sends authorization requests to the Rust cedar-policy evaluator as JSON. The JSON protocol reserves magic single-key object shapes (__entity and __extn) for entity references and extension values. When serializing a CedarMap, there is no validation preventing these reserved keys from being used. If an integrating service builds a CedarMap from caller-supplied key/value data (such as request headers, user-defined metadata, or resource tags), an actor who controls those keys could cause the Rust evaluator to interpret a record as an entity reference. This issue requires the integrating service to build a CedarMap where the an actor controls the keys, and a policy must reference that value in a when/unless clause. This vulnerability has been fixed in versions 2.3.6, 3.4.1, and 4.9.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-843"],"references":["https://github.com/cedar-policy/cedar-java/security/advisories/GHSA-93g4-m6xv-cmvr"],"products":[],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-55772","score":0.00479,"percentile":0.41071,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-93g4-m6xv-cmvr","url":"https://osv.dev/vulnerability/GHSA-93g4-m6xv-cmvr","summary":"CedarJava has type confusion vulnerability ","modified":"2026-07-28T02:00:32.829744818Z","packages":[{"ecosystem":"Maven","name":"com.cedarpolicy:cedar-java","purl":"pkg:maven/com.cedarpolicy/cedar-java","ranges":["<2.3.6"],"fixed":["2.3.6"]},{"ecosystem":"Maven","name":"com.cedarpolicy:cedar-java","purl":"pkg:maven/com.cedarpolicy/cedar-java","ranges":[">=3.1.2 <3.4.1"],"fixed":["3.4.1"]},{"ecosystem":"Maven","name":"com.cedarpolicy:cedar-java","purl":"pkg:maven/com.cedarpolicy/cedar-java","ranges":[">=4.0.0 <4.9.0"],"fixed":["4.9.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}