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  4. CVE 2026 116501 qiskit sdk c api may trigger an out of bounds
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Back to active CVEs
High · CVSS 8.4CVE-2026-116501

Qiskit SDK C API may trigger an out of bounds write on accessing the unitary matrix with qk_circuit_inst_unitary().CVE-2026-116501

Answer in brief

CVE-2026-116501 records a High severity (CVSS 8.4) vulnerability in Qiskit SDK C API may trigger an out of bounds write on accessing the unitary matrix with qk_circuit_inst_unitary().. The current sources do not mark it as known exploited. The current feed maps IBM/Qiskit SDK (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/Qiskit SDK (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/Qiskit SDKgeneric>=2.4.0 <=2.6.1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/Qiskit SDK.
  2. 2Review the reported fix. Source-reported solution: Remediation/Fixes guidance: The issue is addressed in Qiskit versions v2.6.2. This version is patched to detect this situation and write out a sentinel value to identify the instruction is in an inconsistent state. Product(s)Version(s) number and/or range Remediation/Fix/Instructions< Qiskit SDK https://github.com/qiskit/qiskit - qk_circuit_inst_unitary() function>v2.6.2 Upgrade to the patched versions: qiskit v2.6.2.

Evidence timeline and material changes

  1. Published upstream

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 8, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source description

IBM Qiskit SDK 2.4.0 through 2.6.1 could allow a local attacker to execute arbitrary code due to an out-of-bounds write caused by improper input validation when accessing a corrupted unitary matrix.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Arbitrary Code Execution in Qiskit SDK QPY DeserializationSame ibm/qiskit sdk package
  • Unbound Recursion in QPY deserialization can lead to denial of serviceSame ibm/qiskit sdk package

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 8, 2026
References
1 linked source
Open source record