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CVE-2026-55773— CedarJava has a policy injection vulnerability

Quick assessment

Affected
cedar-policy cedar-java
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cedar CedarJava是Cedar组织的一款消息队列中间件。 CedarJava 2.3.6之前版本、3.4.1之前版本和4.9.0之前版本存在代码注入漏洞，该漏洞源于输入处理不当，导致toCedarExpr()方法在将值转换为Cedar源代码时未转义特殊字符，可能允许Cedar表达式注入，从而注入任意Cedar表达式。

CVSS 8.8 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
cedar-policy cedar-java < 2.3.6 affected
>= 3.1.2, < 3.4.1 affected
>= 4.0.0, < 4.9.0 affected
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I. Basic Information for CVE-2026-55773

Vulnerability Information
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Vulnerability Title
CedarJava has a policy injection vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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 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. This vulnerability has been fixed in versions 2.3.6, 3.4.1, and 4.9.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
CedarJava 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cedar CedarJava是Cedar组织的一款消息队列中间件。 CedarJava 2.3.6之前版本、3.4.1之前版本和4.9.0之前版本存在代码注入漏洞，该漏洞源于输入处理不当，导致toCedarExpr()方法在将值转换为Cedar源代码时未转义特殊字符，可能允许Cedar表达式注入，从而注入任意Cedar表达式。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cedar-policy cedar-java < 2.3.6 -

II. Public POCs for CVE-2026-55773

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9628 chars
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III. Intelligence Information for CVE-2026-55773

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Vendor Advisories for CVE-2026-55773 (1)

Same Patch Batch · cedar-policy · 2026-07-13 · 3 CVEs total

CVE-2026-55772 8.8 HIGH CedarJava has a type confusion vulnerability
CVE-2026-55771 8.8 HIGH CedarJava has policy injection, type confusion, and incorrect equality comparison vulnerab

IV. Related Vulnerabilities

Same product: cedar-java
Same vendor: cedar-policy
Same weakness: CWE-94

V. Comments for CVE-2026-55773

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