How severe is CVE-2026-4870?

CVE-2026-4870 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-4870 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4870?

CVE-2026-4870 affects Ibm Qiskit Software Development Kit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4870?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-4870 have an EU (EUVD) identifier?

Yes. CVE-2026-4870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36575.

When was CVE-2026-4870 published?

CVE-2026-4870 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-4870

CVE-2026-4870 is a high-severity vulnerability in Ibm Qiskit Software Development Kit with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36575
Weakness: CWE-674
Affected product: Ibm Qiskit Software Development Kit
Published: 2026-06-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-4870?: 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.
How severe is CVE-2026-4870?: CVE-2026-4870 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-4870 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4870?: CVE-2026-4870 affects Ibm Qiskit Software Development Kit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4870?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-4870 have an EU (EUVD) identifier?: Yes. CVE-2026-4870 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36575.
When was CVE-2026-4870 published?: CVE-2026-4870 was published on 2026-06-12 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7276123

Affected products (1)

cpe:2.3:a:ibm:qiskit_software_development_kit:*:*:*:*:*:*:*:*

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