---
id: CVE-2026-19795
title: >-
  Qiskit could allow a local attacker to cause a denial of service due to a
  stack overflow during deserialization of QPY payloads
summary: >-
  Qiskit could allow a local attacker to cause a denial of service due to a
  stack overflow during deserialization of QPY payloads. A malicious QPY payload
  can trigger a segmentation fault, causing the application to crash when
  deserializin…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-502
published: '2026-09-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T14:17:08.940'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19795'
references:
  - url: 'https://www.ibm.com/support/pages/node/7285932'
    label: psirt@us.ibm.com
tags:
  - nvd
epss: 0.00112
epssPercentile: 0.01536
ingestedAt: '2026-09-05T20:44:37.835Z'
---

## Overview

Qiskit could allow a local attacker to cause a denial of service due to a stack overflow during deserialization of QPY payloads. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.