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critical vulnerability

Qiskit allows arbitrary code execution decoding QPY format versions < 13

Partly patchedCritical · CVSS 9.8EPSS 0.81%

Published Mar 14, 2025 · updated Nov 4, 2026

What to do

  1. Upgrade to a fixed version: qiskit 1.4.2, qiskit 2.0.0rc2.
  2. Some affected packages have no fixed version yet: follow the advisory for mitigations and watch this page for the fix.
  3. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

PyPIqiskit-terra18,489 downloads/week

Vulnerable versions
>= 0.18.0, <= 0.46.3
Fixed in
no fix yet

Check your project: pip show qiskit-terra

PyPIqiskit290,358 downloads/week

Vulnerable versions
<= 1.4.1
Fixed in
1.4.2

Check your project: pip show qiskit

PyPIqiskit290,358 downloads/week

Vulnerable versions
= 2.0.0rc1
Fixed in
2.0.0rc2

Check your project: pip show qiskit

Sources

CWE-502 Deserialization of Untrusted Data

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