Vulnerability · Published Sep 3, 2026 · Assigned by ibm
CVE-2026-19795Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.
Medium 6.2
In plain English
A medium-severity unsafe deserialization in Qiskit SDK from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)6.2Medium
Exploit odds (30 days)0.3%top 77.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Qiskit could allow a local attacker to cause a denial of service due to a stack overflow during deserialization of QPY payloads. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| IBM | Qiskit SDK | 2.1.0 – through 2.5.1 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://www.ibm.com/support/pages/node/7285932 vendor-advisory, patch