Quick answers
- Is CVE-2026-66086 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66086 being exploited in the wild.
- How severe is CVE-2026-66086?
- Critical severity, with a CVSS score of 9.8, published 12 October 2026.
- Which products and versions are affected?
- Unisoc Modem OTA Stack (T8100); Unisoc Modem OTA Stack (T9100); Unisoc Modem OTA Stack (UDX710).
- Is there a fix for CVE-2026-66086?
- 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-2026-66086 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-66086?
- Check whether you run Unisoc Modem OTA Stack (T8100), Unisoc Modem OTA Stack (T9100) or Unisoc Modem OTA Stack (UDX710). 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
A stack-based buffer overflow exists in the modem OTA stack due to improper validation of scheduling information in SIB1 (System Information Block 1) messages. The vulnerability is reachable over the network without authentication and can lead to remote code execution or denial of service. The affected chipsets include T8100, T9100, and UDX710.
Affected products
- Unisoc Modem OTA Stack (T8100)
- Unisoc Modem OTA Stack (T9100)
- Unisoc Modem OTA Stack (UDX710)
Timeline
- 2026-10-12: disclosed