CVE-2026-5559 Details
Description
A vulnerability has been found in AntaresMugisho PyBlade 0.1.8-alpha/0.1.9-alpha. The affected element is the function _is_safe_ast of the file sandbox.py of the component AST Validation. Such manipulation leads to improper neutralization of special elements used in a template engine. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
A code injection vulnerability has been identified in AntaresMugisho PyBlade versions 0.1.8-alpha and 0.1.9-alpha, as well as in 0.2.0-alpha. This vulnerability arises from unsafe expression evaluation in the template rendering process, specifically within the AST validation component. The issue allows access to dangerous Python magic methods, leading to remote code execution by exploiting Python's object model. The vulnerability has been publicly disclosed and is actively exploitable.
Users are advised to upgrade to the latest version of PyBlade, which includes a fixed AST validation that properly checks all node types and blocks access to private attributes.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 5, 2026CISA-ADP
Assessed Apr 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/AntaresMugisho/PyBlade/ | [email protected] | ProductVendor |
| https://github.com/AntaresMugisho/PyBlade/issues/1 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/AntaresMugisho/PyBlade/issues/1#issue-4086730906 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://vuldb.com/submit/782904 | [email protected] | Technical Description |
| https://vuldb.com/vuln/355329 | [email protected] | AdvisoryExploitPartial Content |
| https://vuldb.com/vuln/355329/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1336 | Improper Neutralization of Special Elements Used in a Template Engine | [email protected] |
| CWE-791 | Incomplete Filtering of Special Elements | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| AntaresMugisho PyBlade | All versions |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Apr 5, 2026 | New CVE Received | [email protected] |