---
id: CVE-2026-21089
title: >-
  Improper input validation in removing style tag in libsubextractor.so prior to
  SMR Sep-2026 Release 1 allows local attackers to write out-of-bounds memory.
summary: >-
  Improper input validation in removing style tag in libsubextractor.so prior to
  SMR Sep-2026 Release 1 allows local attackers to write out-of-bounds memory.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-20
vendor: samsung
product: android
affected:
  - android = 14.0
  - android = 15.0
  - android = 16.0
  - android = 17.0
published: '2026-09-09'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:41:02.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21089'
references:
  - url: 'https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09'
    label: mobile.security@samsung.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T17:46:13.175515Z'
scores:
  nvd: 7.8
  cna: 6.9
ingestedAt: '2026-09-13T14:43:50.957Z'
epss: 0.00105
epssPercentile: 0.01218
---

## Overview

Improper input validation in removing style tag in libsubextractor.so prior to SMR Sep-2026 Release 1 allows local attackers to write out-of-bounds memory.

## Affected

- `android = 14.0`
- `android = 15.0`
- `android = 16.0`
- `android = 17.0`

## Remediation

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