Prototype Pollution Vulnerability in RubyLouvre Avalon Component
CVE-2026-12209

6.9MEDIUM

Key Information:

Vendor

Rubylouvre

Status
Avalon
Vendor
CVE Published:
15 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-12209?

A vulnerability has been identified in versions of the RubyLouvre Avalon component up to 2.2.10 that allows for improperly controlled modifications of object prototype attributes. This flaw is located in an unspecified function within src/filters/index.js, undermining the integrity of applications using this component. The vulnerability can be exploited remotely, raising the risk for users who are unaware of its existence. Despite early notifications, the vendor has not responded to address the disclosed issues, leaving users at potential risk of exploitation.

Affected Version(s)

avalon 2.2.0

avalon 2.2.1

avalon 2.2.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-12209 - Proof of Concept

References

https://vuldb.com/vuln/370851
vdb-entry
https://vuldb.com/vuln/370851/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-12209
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Frederick (VulDB User)
VulDB CNA Team
.