Is CVE-2026-124742 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-124742 being exploited in the wild.

How severe is CVE-2026-124742?

Medium severity, with a CVSS score of 5.5, published 11 November 2026.

Is there a fix for CVE-2026-124742?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-124742 attacked?

It is attacked with local access or from the adjacent network, in a software library.

Am I affected by CVE-2026-124742?

Check whether you run Busybox. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-124742: BusyBox divide-by-zero in volume identification FAT parser

CVE-2026-124742 · Severity: medium · CVSS 5.5 · Published 2026-11-11

BusyBox is a lightweight suite of utilities used in embedded systems and container images to manage storage devices and system boot. A flaw in its filesystem volume identification component can crash partition scanning tools when they encounter a specially crafted disk image, causing denial of service that disrupts device discovery and system boot. An attacker with local access or the ability to provide malicious storage media can exploit this to disrupt operations.

Technologies: Busybox. Vendors: Busybox.

Quick answers

Is CVE-2026-124742 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-124742 being exploited in the wild.
How severe is CVE-2026-124742?: Medium severity, with a CVSS score of 5.5, published 11 November 2026.
Which products and versions are affected?: BusyBox BusyBox.
Is there a fix for CVE-2026-124742?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-124742 attacked?: It is attacked with local access or from the adjacent network, in a software library.
Am I affected by CVE-2026-124742?: Check whether you run Busybox. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A divide-by-zero condition exists in the volume_id FAT prober when cluster parameters are not properly validated, specifically when a zero sectors_per_cluster value is encountered. The vulnerability is triggered when partition scanning utilities analyze a specially formatted FAT filesystem on a crafted storage device or disk image, causing an unhandled crash. This is a local or adjacent attack requiring the ability to present untrusted block devices.

Affected products

BusyBox BusyBox

Timeline

2026-11-11: disclosed

References

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