CVE-2026-21089 PUBLISHED

Assigner: SamsungMobile
Reserved: 11.12.2025 Published: 09.09.2026 Updated: 09.09.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Samsung Mobile
Product	Samsung Mobile Devices
Versions	Default: affected unaffected from SMR Sep-2026 Release in Android 14, 15, 16, 17 to * (excl.)

References

https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09

Problem Types

CWE-20: Improper Input Validation