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CVE-2026-19795— Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.

Quick assessment

Affected
IBM Qiskit SDK
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM Qiskit SDK是美国IBM公司的一款量子计算软件开发工具包。 IBM Qiskit SDK 2.1.0版本至2.5.1版本存在反序列化注入漏洞，该漏洞源于反序列化过程中对特制对象处理不当，可能导致本地攻击者造成拒绝服务。

CVSS 6.2 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Qiskit SDK 2.1.0≤ 2.5.1 affected
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I. Basic Information for CVE-2026-19795

Vulnerability Information
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Vulnerability Title
Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
IBM Qiskit SDK 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM Qiskit SDK是美国IBM公司的一款量子计算软件开发工具包。 IBM Qiskit SDK 2.1.0版本至2.5.1版本存在反序列化注入漏洞，该漏洞源于反序列化过程中对特制对象处理不当，可能导致本地攻击者造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM Qiskit SDK 2.1.0 ~ 2.5.1 cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19795

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III. Intelligence Information for CVE-2026-19795

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Vendor Advisories for CVE-2026-19795 (1)

Same Patch Batch · IBM · 2026-09-03 · 6 CVEs total

CVE-2026-8862 7.5 HIGH Vulnerabilities exists in IBM Netezza Software
CVE-2026-9745 6.5 MEDIUM Vulnerabilities exists in IBM Netezza Software
CVE-2026-9036 5.9 MEDIUM Vulnerabilities exists in IBM Netezza Software
CVE-2026-9736 5.3 MEDIUM Vulnerabilities exists in IBM Netezza Software
CVE-2026-9744 5.3 MEDIUM Vulnerabilities exists in IBM Netezza Software

IV. Related Vulnerabilities

Same product: Qiskit SDK
Same vendor: IBM
Same weakness: CWE-502

V. Comments for CVE-2026-19795

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