Quick answers
- Is CVE-2026-102721 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102721 being exploited in the wild.
- How severe is CVE-2026-102721?
- Informational severity, published 29 September 2026.
- Which products and versions are affected?
- Eclipse Foundation ThreadX NetX Duo <6.6.0.
- Is there a fix for CVE-2026-102721?
- 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-2026-102721 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-102721?
- Check whether you run Eclipse Foundation ThreadX NetX Duo at an affected version. 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 vulnerability is a heap buffer over-read in the TFTP client error message parsing code (nxd_tftp_client.c), where error message strings are copied without checking if the input buffer pointer remains within packet bounds. Three receive code paths copy the error message string using only the destination buffer size and NUL terminator as limits, allowing an ERROR packet with no trailing NUL to read past the datagram into adjacent heap memory. The over-read data lands in nx_tftp_client_error_string, which applications typically log or display, exposing adjacent memory contents.
Affected products
- Eclipse Foundation ThreadX NetX Duo <6.6.0
Timeline
- 2026-09-29: disclosed