CVE-2026-55771Network attack vector

Incorrect identity decisions via inverted equals branches

Published Jul 13, 2026 · Updated Jul 13, 2026

Incorrect comparison in Cedar Policy CedarJava before 4.9.0 allows attackers to influence integrator decisions through entity identifier checks. EntityIdentifier.equals() reverses its null and self-reference branches, returning true for null and false when an object is compared with itself. The defect does not affect authorization decisions computed by the Rust engine; impact requires integrator code to rely on these Java equality results.

CVSS severity8.8
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect comparison in Cedar Policy CedarJava before 4.9.0 allows attackers to influence integrator decisions through entity identifier checks. EntityIdentifier.equals() reverses its null and self-reference branches, returning true for null and false when an object is compared with itself. The defect does not affect authorization decisions computed by the Rust engine; impact requires integrator code to rely on these Java equality results.

The record

CVE
CVE-2026-55771
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
Cedar Policy
Product
CedarJava
Classifications
CWE-697, CWE-843, CWE-94
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cedar Policy · CedarJavaversion=< 4.9.0

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-697Incorrect Comparison
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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