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🛡️ CVE-2026-55771 — cedar-java

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-697 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Cedar-Java has policy injection, type confusion, and incorrect equality comparison vulnerabilities

Summary

CedarJava 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.

Impact

EntityIdentifier.equals() has inverted null/self branches

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.

Impacted versions:

< 4.9

Patches

It 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.

Workarounds

Avoid relying on EntityIdentifier.equals() for security-sensitive comparisons until upgraded to version 4.9.

References

If you have any questions or comments about this advisory, Cedar asks that you contact us directly via email to [[email protected]](mailto:[email protected]). Please do not create a public GitHub issue.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-55771 is classified as CWE-697: Incorrect Comparison. The product compares two entities in a security-relevant context, but the comparison is incorrect.

Affected software

CVE-2026-55771 is recorded against 2 packages.

  • com.cedarpolicy:cedar-java (from 4.0.0 up to 4.9.0)
  • unknown

Timeline and source

Published on 28 July 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)

Other advisories for this package

com.cedarpolicy:cedar-java has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-697: Incorrect Comparison) in other software:

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-697
Public Exploit ✅ No
Source NVD
Published 2026-07-28
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
com.cedarpolicy:cedar-java 4.0.0 4.9.0
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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