# Qiskit allows arbitrary code execution decoding QPY format versions < 13

Advisory record · `GHSA-6m2c-76ff-6vrf`

- **Identifiers:** `GHSA-6m2c-76ff-6vrf` · `CVE-2025-2000` · `PYSEC-2026-510` · `PYSEC-2026-511`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 29 Jun 2026
- **Updated:** 2 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 29 Jun 2026, 11:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `qiskit` (PyPI): affected `<1.4.2 || >=2.0.0rc1, <2.0.0rc2`; fixed in `1.4.2`, `2.0.0rc2`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Qiskit versions before 1.4.2, and versions from 2.0.0rc1 up to but not including 2.0.0rc2, are vulnerable when loading QPY files in formats below version 13. An attacker who supplies a maliciously crafted QPY file that a process loads with qiskit.qpy.load() can execute arbitrary Python code. Upgrade to Qiskit 1.4.2 or 2.0.0rc2.

Written 10 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (ibm)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0081, the 57th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 14 Mar 2025, 19:56 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-6m2c-76ff-6vrf)

## Sources

- [GitHub Advisory Database: GHSA-6m2c-76ff-6vrf](https://github.com/advisories/GHSA-6m2c-76ff-6vrf)
- [OSV: GHSA-6m2c-76ff-6vrf](https://osv.dev/vulnerability/GHSA-6m2c-76ff-6vrf)
- <https://github.com/Qiskit/qiskit/security/advisories/GHSA-6m2c-76ff-6vrf>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-2000>
- <https://github.com/Qiskit/qiskit>
- <https://www.ibm.com/support/pages/node/7185949>
- <https://pypi.org/project/qiskit>
- <https://github.com/advisories/GHSA-6m2c-76ff-6vrf>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-6m2c-76ff-6vrf>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-6m2c-76ff-6vrf/>. Everything for agents: <https://agentprime.io/llms.txt>.