What is CVE-2026-19795?

CVE-2026-19795 is a medium-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 6.2/10. Published 2026-09-03.

How severe is CVE-2026-19795?

Medium severity. CVSS v3 base score is 6.2 out of 10.

CVE-2026-19795

CVE-2026-19795

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.

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

psirt@us.ibm.com

Frequently asked questions

What is CVE-2026-19795?: CVE-2026-19795 is a medium-severity vulnerability, classified under Deserialization of Untrusted Data. CVSS score: 6.2/10. Published 2026-09-03.
How severe is CVE-2026-19795?: Medium severity. CVSS v3 base score is 6.2 out of 10.