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CVE-2026-4870 IBM CVE debrief

CVE-2026-4870 is a HIGH severity vulnerability in IBM Qiskit SDK versions 0.43.0 through 2.5.0. The vulnerability could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser. The CVSS score for this vulnerability is 7.5.

Vendor
IBM
Product
Qiskit SDK
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-16
Advisory published
2026-06-12
Advisory updated
2026-06-16

Who should care

Users of IBM Qiskit SDK versions 0.43.0 through 2.5.0 should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by uncontrolled recursion in the parser of IBM Qiskit SDK. This could allow an attacker to trigger a segmentation fault leading to a denial of service.

Defensive priority

HIGH

Recommended defensive actions

  • Users should update to a version of IBM Qiskit SDK that is not vulnerable.
  • Users can refer to [ref-4] for more information on the vulnerability and potential mitigations.

Evidence notes

The CVE record [cve-org] and NVD detail [nvd] provide additional information on this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4870 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4870

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4870 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4870

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.