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CVE-2026-4870— Qiskit SDK is vulnerable to specific functions may recurse too deeply and overflow the available stack space, when encountering certain classical expressions.

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 0.43.0至2.5.0及之前版本存在资源管理错误漏洞，该漏洞源于解析器中未受控制的递归，可能导致攻击者触发分段违规，进而导致拒绝服务。

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
IBM Qiskit SDK 0.43.0≤ 2.5.0 affected
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I. Basic Information for CVE-2026-4870

Vulnerability Information
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Vulnerability Title
Qiskit SDK is vulnerable to specific functions may recurse too deeply and overflow the available stack space, when encountering certain classical expressions.
Source: CVE Program / CVE List V5
Vulnerability Description
IBM Qiskit SDK 0.43.0 through 2.5.0 could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
IBM Qiskit SDK 资源管理错误漏洞
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 0.43.0至2.5.0及之前版本存在资源管理错误漏洞，该漏洞源于解析器中未受控制的递归，可能导致攻击者触发分段违规，进而导致拒绝服务。
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 0.43.0 ~ 2.5.0 cpe:2.3:a:ibm:qiskit_sdk:0.43.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4870

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III. Intelligence Information for CVE-2026-4870

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Vendor Advisories for CVE-2026-4870 (1)

IV. Related Vulnerabilities

Same product: Qiskit SDK
Same vendor: IBM

V. Comments for CVE-2026-4870

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