CVE-2026-19795
Received Received - Intake

IBM Qiskit SDK Deserialization DoS Vulnerability

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: IBM Corporation

Description
IBM Qiskit SDK 2.1.0 through 2.5.1 could allow a local attacker to cause a denial of service due to improper handling of a specially crafted object during deserialization. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-04
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-19795
EUVD
EUVD-2026-70714

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ibm qiskit_sdk From 2.1.0 (inc) to 2.5.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

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Executive Summary

IBM Qiskit SDK versions 2.1.0 through 2.5.1 have a vulnerability where improper handling of specially crafted objects during deserialization can lead to a denial of service. A malicious QPY payload can cause a segmentation fault, crashing the application when processing untrusted input.

Detection Guidance

This vulnerability involves improper handling of QPY payloads during deserialization in IBM Qiskit SDK versions 2.1.0 through 2.5.1. To detect it, check the installed version of Qiskit using the command 'pip show qiskit' or 'qiskit.__version__' in a Python environment. If the version falls within 2.1.0 to 2.5.1, the system is potentially vulnerable.

Impact Analysis

This vulnerability allows a local attacker to crash the application by providing malicious input, causing a denial of service. This disrupts normal operations and may lead to loss of availability for services relying on Qiskit SDK.

Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by causing service disruptions due to denial of service attacks. A crash in the application handling untrusted input may lead to data processing interruptions, potentially violating availability requirements under these regulations.

Mitigation Strategies

Upgrade IBM Qiskit SDK to a version outside the vulnerable range (2.1.0 to 2.5.1). Use the command 'pip install --upgrade qiskit' to update to the latest secure version. Avoid processing untrusted QPY payloads until the update is applied.

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