---
id: CVE-2026-66086
title: >-
  In the modem OTA stack, there is a possible stack-based buffer overflow due to
  improper validation of scheduling information in SIB1 messages
summary: >-
  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 pri…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T02:16:57.600'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66086'
references:
  - url: >-
      https://www.unisoc.com/en/support/product-security-bulletin/2109454821805424641
    label: security@unisoc.com
tags:
  - nvd
ingestedAt: '2026-10-12T14:50:34.075Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.