Improper Neutralization Vulnerability in AntaresMugisho PyBlade Template Engine
CVE-2026-5559

5.3MEDIUM

Key Information:

Vendor

Antaresmugisho

Status
Pyblade
Vendor
CVE Published:
5 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5559?

A vulnerability exists in AntaresMugisho PyBlade versions 0.1.8-alpha and 0.1.9-alpha due to improper neutralization of special elements within the AST Validation component. This potential security flaw stems from the function _is_safe_ast in sandbox.py, allowing attackers to manipulate templates remotely. This could lead to unauthorized code execution if successfully exploited. Despite early notifications to the project maintainers, there has been no response regarding remediation efforts, raising concerns about the ongoing risk to users.

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Affected Version(s)

PyBlade 0.1.8-alpha

PyBlade 0.1.9-alpha

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-2026-5559 - Proof of Concept

References

https://vuldb.com/vuln/355329
vdb-entrytechnical-description
https://vuldb.com/vuln/355329/cti
signaturepermissions-required
https://vuldb.com/submit/782904
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

zhangxinyu06 (VulDB User)
VulDB CNA Team
JSON
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