CVE-2026-101337
Description
A flaw was found in NSD (Name Server Daemon). When parsing DNS zone files containing base64-encoded data formatted in segments of three characters or fewer, NSD incorrectly calculates token sizes, resulting in a stack-based buffer overflow. An attacker who can supply or manipulate a zone file loaded by the server could exploit this flaw to overwrite stack memory with controlled data, potentially achieving arbitrary code execution or causing a Denial of Service (DoS).
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
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