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Vulnerability · Published Apr 5, 2026 · Assigned by VulDB

CVE-2026-5559AntaresMugisho PyBlade AST Validation sandbox.py _is_safe_ast special elements used in a template engine

Medium 6.3

In plain English

A medium-severity security flaw in PyBlade from AntaresMugisho. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.3%top 75.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIpybladeno fix listedGHSA-23jg-5f8m-gw8c
PyPIpybladeno fix listedPYSEC-2026-2975

Affected products (as reported)

VendorProductVersions
AntaresMugisho PyBlade 0.1.8-alpha0.1.9-alpha

Weakness: CWE-1336, CWE-791 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References