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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 2.1.0 至 2.5.1 版本可能存在拒绝服务（DoS）漏洞。由于在反序列化过程中对特制对象的处理不当，本地攻击者可利用一个恶意的 QPY 负载（payload）触发段错误（segmentation fault），导致应用在反序列化不可信输入时崩溃。

CVSS 6.2 · Medium
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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
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.
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

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-2026-9744 5.3 MEDIUM Vulnerabilities exists in IBM Netezza Software
CVE-2026-9736 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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