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CVE-2026-19795

Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.

MEDIUM
6.2
CVSS Score
Published: September 3, 2026 at 07:56 PM UTC
Updated: September 8, 2026 at 02:31 PM UTC
1 product affected across 1 vendorQiskit

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Severity
MEDIUM6.2
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Qiskit· IBMcomposer
60%
2.1.0 ≤ v ≤ 2.5.12.1.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://www.ibm.com/support/pages/node/7285932

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.2MEDIUMibm
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-502

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