CVE-2026-102720 is a vulnerability in Eclipse Threadx Netx Duo
Published on September 29, 2026
DHCP client option walk drifts one byte per skipped option, reading past the received message and past the saved options buffer
In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the DHCP client's option walk advances its offset one byte less than its read pointer for every option it skips. A DHCP server, or any host on the link that answers first, can make the client read up to about a kilobyte past the received message, and the same walk copies out-of-bounds bytes into the application's buffer when it retrieves a user option.
Vulnerability Analysis
Weakness Types
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
What is an off-by-five Vulnerability?
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.
CVE-2026-102720 has been classified to as an off-by-five vulnerability or weakness.
Products Associated with CVE-2026-102720
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Affected Versions
Eclipse Foundation Eclipse ThreadX NetX Duo:- Version 6.0, <= 6.5.2.202603a is affected.
- Version 6.5.2.202603b is unaffected.