PYSEC-2026-1859 Malciously crafted QPY files can allows Remote Attackers to Cause Denial of Service in Qiskit

Impact A maliciously crafted QPY file containing a malformed symengine serialization stream as part of the larger QPY serialization of a ParameterExpression object can cause a segfault within the symengine library, allowing an attacker to terminate the hosting process deserializing the QPY payloa...

CVE-2025-1403

CVE-2025-1403 affects Qiskit SDK from 0.45.0 to 1.2.4, where a malicious QPY file with a malformed symengine serialization stream can trigger a segfault in the symengine library, enabling remote denial of service. The Red Hat, OSV, and IBM advisories confirm the vulnerability and provide remediat...