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TI-2026-40260 Aliases CVE-2026-55771GHSA-4r9r-4425-74p7

CedarJava has policy injection, type confusion, and incorrect equality comparison vulnerabilities

Priority MEDIUM 41CWE-697Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-843 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00575 47th percentileScored 2026-11-07
Fix Fixed cedar-java (cedar-policy): 4.9.0com.cedarpolicy:cedar-java (Maven): 2.3.6, 3.4.1, 4.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
cedar-policycedar-javabefore 4.9.04.9.0Patch availableCNA
—com.cedarpolicy:cedar-java (Maven)before 2.3.62.3.6Patch availableGHSA-4r9r-4425-74p7
—com.cedarpolicy:cedar-java (Maven)3.1.2 to before 3.4.13.4.1Patch availableGHSA-4r9r-4425-74p7
—com.cedarpolicy:cedar-java (Maven)4.0.0 to before 4.9.04.9.0Patch availableGHSA-4r9r-4425-74p7
  • cedar-java Vendorcedar-policy Affected before 4.9.0 Fixed in 4.9.0 Patch available CNA
  • com.cedarpolicy:cedar-java (Maven) Vendor— Affected before 2.3.6 Fixed in 2.3.6 Patch available GHSA-4r9r-4425-74p7
  • com.cedarpolicy:cedar-java (Maven) Vendor— Affected 3.1.2 to before 3.4.1 Fixed in 3.4.1 Patch available GHSA-4r9r-4425-74p7
  • com.cedarpolicy:cedar-java (Maven) Vendor— Affected 4.0.0 to before 4.9.0 Fixed in 4.9.0 Patch available GHSA-4r9r-4425-74p7

Remediation

  • Fix · CNA cedar-java (cedar-policy) Fixed in 4.9.0
  • Fix · GHSA-4r9r-4425-74p7 com.cedarpolicy:cedar-java (Maven) Fixed in 2.3.6 Advisory →
  • Fix · GHSA-4r9r-4425-74p7 com.cedarpolicy:cedar-java (Maven) Fixed in 3.4.1 Advisory →
  • Fix · GHSA-4r9r-4425-74p7 com.cedarpolicy:cedar-java (Maven) Fixed in 4.9.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55771
  2. 2026-10-03 Alias added: GHSA-4r9r-4425-74p7

References

Advisory 1

Other 2

  • TI-2026-40262 CedarJava has a policy injection vulnerability CVSS 3.1HIGH 8.8
  • TI-2026-40261 CedarJava has a type confusion vulnerability CVSS 3.1HIGH 8.8
  • TI-2026-36628 @cedar-policy/authorization-for-expressjs has an authorization bypass via query string manipulation CVSS 3.1HIGH 8.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences