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🛡️ CVE-2026-55773 — cedar-java

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-94 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CedarJava has policy injection vulnerability

Summary

CedarJava is an open source Java implementation of the Cedar policy language, used for fine-grained authorization decisions. Under certain circumstances, improper input handling could allow policy injection.

Impact

Cedar-expression injection via unescaped toCedarExpr()

The toCedarExpr() method on Cedar Value types does not escape special characters (" or \) when converting values to Cedar source code. If an integrator uses toCedarExpr() to build policy text at runtime from user-controlled values, an actor could inject arbitrary Cedar expressions. For example, injecting || true into a permit ... when { ... } clause could make the permit unconditional, or injecting && false into a forbid clause could prevent the forbid from triggering.

This issue requires the integrator to use toCedarExpr() to build policy text at runtime from user-controlled input.

Impacted versions:

< 4.9

Patches

Addressed in CedarJava version 2.3.6, 3.4.1, and 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

Validate and sanitize all user-supplied input before passing it to toCedarExpr(). Avoid building policy text at runtime from user-controlled values.

References

If you have any questions or comments about this advisory, we ask that you contact us directly via email to [cedar-policy-security@lists.cncf.io](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-2026-55773 is classified as CWE-94: Code Injection. Input is incorporated into code that the runtime evaluates, so an attacker can have their own code executed.

Affected software

CVE-2026-55773 is recorded against 2 packages.

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

Timeline and source

Published on 19 June 2026 and last revised on 28 July 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-94: Code Injection) 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-94
Public Exploit ✅ No
Source NVD
Published 2026-06-19
Updated 2026-08-20
Modified 2026-07-28
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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