CVE-2026-19795

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...

CVE-2026-19795 Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.

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...

CVE-2026-19795

IBM Qiskit SDK versions 2.1.0 through 2.5.1 are vulnerable to a denial of service when deserializing QPY files . The root cause is improper handling of a specially crafted object during deserialization, which may overflow the available stack space and trigger a segmentation fault , crashing the a...

CVE-2026-19795 Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.

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...

EUVD-2026-70714

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...

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

Summary A maliciously constructed QPY payload that contains specifically constructed ParameterExpression objects as part of the payload can trigger a segfault in the evaluation of those expressions during deserialization. The function qiskit.qpy.load may recurse too deeply and overflow the...

PT-2026-85243

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...

CVE-2026-19795: Deserialization of Untrusted Data

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...

Malciously crafted QPY files can allows Remote Attackers to Cause Denial of Service in Qiskit

ImpactA 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 payload...

Malciously crafted QPY files can allows Remote Attackers to Cause Denial of Service in Qiskit

ImpactA 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 payload...

PT-2026-53582

Impact A maliciously crafted QPY file can potentially execute arbitrary-code embedded in the payload without privilege escalation when deserializing QPY formats 13. A python process calling Qiskit's qiskit.qpy.load function could potentially execute any arbitrary Python code embedded in the corre...

EUVD-2025-6417

Malicious code in bioql PyPI...

Security Bulletin: Qiskit SDK Vulnerability Allows Remote Attackers to Cause Denial of Service via Maliciously Crafted QPY File

Summary 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. Vulnerability Details...

Arbitrary Code Execution (ACE)

Qiskit is vulnerable to Arbitrary Code Execution ACE. The vulnerability is due to unsafe deserialization in the qiskit.qpy.load function, which allows a maliciously crafted QPY file to execute embedded Python code without privilege escalation...

CVE-2025-2000

A maliciously crafted QPY file can potential execute arbitrary-code embedded in the payload without privilege escalation when deserialising QPY formats 13. A python process calling Qiskit 0.18.0 through 1.4.1's qiskit.qpy.load function could potentially execute any arbitrary Python code embedded...

Deserialization of Untrusted Data

Overview qiskit-terra is a Software for developing quantum computing programs Affected versions of this package are vulnerable to Deserialization of Untrusted Data through the qiskit.qpy.load function. An attacker can execute arbitrary code by crafting a malicious QPY file and loading it via this...

Qiskit allows arbitrary code execution decoding QPY format versions < 13

Impact A maliciously crafted QPY file can potentially execute arbitrary-code embedded in the payload without privilege escalation when deserializing QPY formats 13. A python process calling Qiskit's qiskit.qpy.load function could potentially execute any arbitrary Python code embedded in the corre...

Duplicate Advisory: Qiskit allows arbitrary code execution decoding QPY format versions < 13

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6m2c-76ff-6vrf. This link is maintained to preserve external references. Original Description A maliciously crafted QPY file can potential execute arbitrary-code embedded in the payload without privilege...

GHSA-3PWP-2FQJ-6G2P Duplicate Advisory: Qiskit allows arbitrary code execution decoding QPY format versions < 13

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6m2c-76ff-6vrf. This link is maintained to preserve external references. Original Description A maliciously crafted QPY file can potential execute arbitrary-code embedded in the payload without privilege...

Security Bulletin: Arbitrary QPY Execution in Qiskit SDK QPY Deserialization < 13

Summary A maliciously crafted QPY payload can potential execute arbitrary-code embedded in the payload without privilege escalation when deserialising QPY format versions 13. A Python process calling Qiskit's qiskit.qpy.load function could potentially execute any arbitrary Python code embedded in...