CVE-2026-66086

CVE-2026-66086

In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.

Vulnerability class: Buffer Overflow

Published .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-66086?
CVE-2026-66086 is a critical-severity vulnerability, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-12.
How severe is CVE-2026-66086?
Critical severity. CVSS v3 base score is 9.8 out of 10.