# CVE-2025-1403: PYSEC-2026-3045 - Malciously crafted QPY files can allows Remote Attackers to Cause Denial of Service in Qiskit

Source: https://junglewise.ai/threats/cve-2025-1403-malciously-crafted-qpy-files-can-allows-remote-attackers-to-cause  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2025-1403 · Severity: low · CVSS 3.1 · Published 2026-07-13

Malciously crafted QPY files can allows Remote Attackers to Cause Denial of Service in Qiskit

Technologies: [qiskit (PyPI)](https://junglewise.ai/threats/technologies/qiskit). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2025-1403 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-1403 being exploited in the wild.

**How severe is CVE-2025-1403?** Low severity, with a CVSS score of 3.1, published 13 July 2026.

**Which products and versions are affected?** qiskit (PyPI) ECOSYSTEM:introduced=0.45.0,fixed=1.3.0; qiskit-terra (PyPI) ECOSYSTEM:introduced=0.45.0,last_affected=0.46.3.

**Is there a fix for CVE-2025-1403?** Yes. qiskit (PyPI): upgrade to 1.3.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-1403?** Check whether you run qiskit (PyPI) or qiskit-terra (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- qiskit (PyPI): upgrade to 1.3.0 or later

  ```sh
  pip install "qiskit>=1.3.0"
  ```


## Affected products

- qiskit (PyPI) ECOSYSTEM:introduced=0.45.0,fixed=1.3.0
- qiskit-terra (PyPI) ECOSYSTEM:introduced=0.45.0,last_affected=0.46.3

## Identifiers

- CVE-2025-1403
- GHSA-fpmr-m242-xm7x
- PYSEC-2026-1859
- PYSEC-2026-3045

## Related threats

- [Qiskit allows arbitrary code execution decoding QPY format versions < 13](https://junglewise.ai/threats/cve-2025-2000-qiskit-allows-arbitrary-code-execution-decoding-qpy-format)
- [Qiskit arbitrary code execution in QPY deserialization](https://junglewise.ai/threats/qiskit-arbitrary-code-execution-in-qpy-deserialization-9a28911c)