Samsung Devices Style Tag Removal libsubextractor.so input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.8$0-$5k1.43+

Summaryinfo

A vulnerability categorized as very critical has been discovered in Samsung Devices. This issue affects some unknown processing of the file libsubextractor.so of the component Style Tag Removal. Such manipulation leads to input validation. This vulnerability is referenced as CVE-2026-21089. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Samsung Devices (affected version unknown). It has been rated as very critical. Affected by this issue is an unknown functionality of the file libsubextractor.so of the component Style Tag Removal. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at security.samsungmobile.com. This vulnerability is handled as CVE-2026-21089 since 12/11/2025. The exploitation is known to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-3219). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Samsung Android

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.8

VulDB Base Score: 8.8
VulDB Temp Score: 8.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

12/11/2025 CVE reserved
09/09/2026 +271 days Advisory disclosed
09/09/2026 +0 days VulDB entry created
09/09/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: samsung.com

Advisory: security.samsungmobile.com
Status: Confirmed

CVE: CVE-2026-21089 (🔒)
GCVE (CVE): GCVE-0-2026-21089
GCVE (VulDB): GCVE-100-401570
CERT Bund: WID-SEC-2026-3219 - Samsung Android: Mehrere Schwachstellen

Entryinfo

Created: 09/09/2026 07:12
Updated: 09/09/2026 09:27
Changes: 09/09/2026 07:12 (64), 09/09/2026 09:27 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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