CVE-2026-124737
Busybox: heap buffer overflow in the tftp client on fallback to the default block size
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in BusyBox. When the TFTP (Trivial File Transfer Protocol) client requests a custom small block size and receives a standard response, it falls back to the default block size without resizing the allocated memory buffer. A malicious TFTP server can exploit this issue by sending standard-sized network packets during a transfer, causing a heap buffer overflow. This flaw allows an attacker to achieve arbitrary code execution or cause a Denial of Service (DoS) by crashing the application.
| CWE | CWE-787 |
| Vendor | red hat |
| Product | red hat enterprise linux 6 |
| Published | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Hardened Images
All versions affected References
Credits
Red Hat would like to thank ducanhluu for reporting this issue.