Quick answers
- Is CVE-2026-102720 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102720 being exploited in the wild.
- How severe is CVE-2026-102720?
- Informational severity, published 29 September 2026.
- Which products and versions are affected?
- Microsoft NetX Unknown.
- Is there a fix for CVE-2026-102720?
- 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-2026-102720 attacked?
- It is attacked from the adjacent network, in a software library.
- Am I affected by CVE-2026-102720?
- Check whether you run Microsoft NetX 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 an off-by-one error in the DHCP option parsing loop (nxd_dhcp_client.c) where a pointer and counter are maintained separately but advance by different amounts. For each skipped option, the data pointer advances by size+2 bytes while the bound-check counter only advances by size+1, causing the pointer to drift past the message boundary while the loop condition still evaluates as true. This leads to heap-buffer-overflow reads when parsing a DHCP OFFER with a long chain of skippable options, occurring during client initialization before network configuration is complete.
Affected products
- Microsoft NetX Unknown
Timeline
- 2026-09-29: disclosed