CVE-2026-12209— RubyLouvre avalon Template Filter index.js prototype pollution
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 11
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RubyLouvre | avalon | 2.2.0 | affected |
2.2.1 | affected | ||
2.2.2 | affected | ||
2.2.3 | affected | ||
2.2.4 | affected | ||
2.2.5 | affected | ||
2.2.6 | affected | ||
2.2.7 | affected | ||
| … +3 more rows | |||
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I. Basic Information for CVE-2026-12209
Vulnerability Information
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Vulnerability Title
RubyLouvre avalon Template Filter index.js prototype pollution
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification of object prototype attributes. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1321
Source: NVD (National Vulnerability Database)
Vulnerability Title
rubylouvre avalon 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
avalon是rubylouvre个人开发者的一款前端开发框架。 RubyLouvre avalon 2.2.10及之前版本存在安全漏洞，该漏洞源于Template Filter Handler组件中src/filters/index.js文件的一个未知函数存在对象原型属性修改不当的问题，可能导致攻击者远程发起攻击。
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 |
|---|---|---|---|---|
| RubyLouvre | avalon | 2.2.0 | cpe:2.3:a:rubylouvre:avalon:*:*:*:*:*:*:*:* |
II. Public POCs for CVE-2026-12209
| # | POC Description | Source Link | Shenlong Link |
|---|
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Proof of Concept for CVE-2026-12209 (1)
IV. Related Vulnerabilities
Same weakness: CWE-1321
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V. Comments for CVE-2026-12209
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