CVE-2026-124747 Busybox: heap buffer overflow in wget ftp resume when the resume offset exceeds the reported file size
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-124747?
CVE-2026-124747 is a high-severity vulnerability in Red Hat Enterprise Linux 6, published on 10 Nov 2026.
Official description
A flaw was found in BusyBox. When resuming a download over File Transfer Protocol (FTP), the wget utility fails to verify that the resume offset does not exceed the file size reported by the server, resulting in an integer calculation error. A malicious FTP server or an on-path network attacker can exploit this issue by returning crafted file size metadata, triggering a heap-based buffer overflow with attacker-controlled data. Successful exploitation may allow an attacker to execute arbitrary code or crash the application, resulting in a denial of service (DoS).
Weakness: CWE-787
Which versions are affected by CVE-2026-124747?
How do I fix CVE-2026-124747?
No fix has been published for CVE-2026-124747 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-124747 being exploited?
There is no known exploitation of CVE-2026-124747 in the wild and no public exploit code.
Sources
Also known as GHSA-7mcj-w43r-5jqf, UBUNTU-CVE-2026-124747.