Low

PyBlade: SSTI/RCE via Bypassed AST Validation in sandbox.py

Disclosed: 05.04.2026
Updated: 11.10.2026 14:18

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 software

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Platform	Package	Vulnerable versions	Fixed in
Python (PyPI)	pyblade	>= 0.1.8-alpha, <= 0.2.0-alpha	no fix

References

CVSS score 6.3/10

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-791
Platform: Python (PyPI)
Package: pyblade
Disclosed: 05.04.2026
Updated: 11.10.2026 14:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2975 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-23jg-5f8m-gw8c - CC BY 4.0

Vulnerability history: pyblade

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

This is the only known vulnerability of this package.

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