CVE-2026-4870 Denial of service in Qiskit SDK
An attacker can cause a segmentation fault and denial of service in the Qiskit SDK by triggering uncontrolled recursion in the parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4870?
CVE-2026-4870 is a high-severity denial of service vulnerability in IBM Qiskit SDK, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM Qiskit SDK 0.43.0 through 2.5.0 could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser.
Weakness: CWE-674
Which versions are affected by CVE-2026-4870?
It affects 1 product.
Products include Ibm Qiskit Software Development Kit.
How do I fix CVE-2026-4870?
No fix has been published for CVE-2026-4870 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-4870 being exploited?
There is no known exploitation of CVE-2026-4870 in the wild and no public exploit code.