Is CVE-2026-5559 actively exploited?

No active exploitation of CVE-2026-5559 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5559 be exploited remotely?

Yes. CVE-2026-5559 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5559?

CVE-2026-5559 has a CVSS score of 6.3 (MEDIUM).

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MEDIUM

CVE-2026-5559

CWE-791Published: April 5, 2026· Updated: Apr 7, 2026

6.3

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:4.2th

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.

NVD Source

Technical Analysis

CVE-2026-5559 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.