Quick answers
- Is CVE-2026-124737 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124737 being exploited in the wild.
- How severe is CVE-2026-124737?
- High severity, with a CVSS score of 7.5, published 11 November 2026.
- Which products and versions are affected?
- BusyBox BusyBox.
- Is there a fix for CVE-2026-124737?
- 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-2026-124737 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-124737?
- 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
The TFTP client fails to resize its allocated memory buffer when falling back from a requested custom small block size to the default block size. A malicious TFTP server exploits this by sending standard-sized packets during transfer, causing a heap buffer overflow (CWE-787). The vulnerability requires an active connection to an untrusted server with a non-default reduced block size, but achieves unauthenticated remote code execution or denial of service.
Affected products
- BusyBox BusyBox
Timeline
- 2026-11-11: disclosed