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Critical, CVSS 9.8amended

Qiskit allows arbitrary code execution decoding QPY format versions < 13

CVE-2025-2000GHSA-6m2c-76ff-6vrf

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI qiskit

    Affected
    <= 1.4.1>= 2.0.0rc1, <= 2.0.0rc1
    Fixed in
    1.4.2, 2.0.0rc2

  • PyPI qiskit-terra

    Affected
    >= 0.18.0, <= 0.46.3
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
9.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2025-2000: 0.81% estimated exploitation activity in the next 30 days; percentile 56.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact A maliciously crafted QPY file can potentially execute arbitrary-code embedded in the payload without privilege escalation when deserializing QPY formats < 13. A python process calling Qiskit's qiskit.qpy.load() function could potentially execute any arbitrary Python code embedded in the correct place in the binary file as part of a specially constructed payload. Patches Fixed in Qiskit 1.4.2 and in Qiskit 2.0.0rc2

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-6m2c-76ff-6vrf

  2. Revision 2 · amended ·

    Amended from ghsa record GHSA-6m2c-76ff-6vrf

  3. Revision 1 · created ·

    Published from osv record GHSA-6m2c-76ff-6vrf

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-2000

Advisory: Qiskit allows arbitrary code execution decoding QPY format versions < 13
IDs: CVE-2025-2000, GHSA-6m2c-76ff-6vrf
Record: https://patchnext.com/advisories/cve-2025-2000 (revision 3, source checked 4 Nov 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: qiskit 2.0.0rc2, 1.4.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI qiskit: affected <= 1.4.1; >= 2.0.0rc1, <= 2.0.0rc1; fixed in 1.4.2, 2.0.0rc2
- PyPI qiskit-terra: affected >= 0.18.0, <= 0.46.3

## Suggested inspection (read-only)
- `python -m pip show qiskit`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show qiskit-terra`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on qiskit, qiskit-terra.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6m2c-76ff-6vrf (OSV record GHSA-6m2c-76ff-6vrf lists affected ranges: PyPI qiskit-terra >=0.18.0 =0 =2.0.0rc1 <2.0.0rc2 (fixed))
- Verified: https://github.com/advisories/GHSA-6m2c-76ff-6vrf (GitHub-reviewed advisory GHSA-6m2c-76ff-6vrf lists affected ranges: PyPI qiskit-terra >=0.18.0 =0 =2.0.0rc1 <=2.0.0rc1)

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