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Samsung Mobile Devices CVE-2026-21088

| EUVDEUVD-2026-74629 MEDIUM
Improper Input Validation (CWE-20)
2026-09-09 SamsungMobile GHSA-rvhf-9rr9-xw9h
Buffer Overflow Samsung Mobile Devices Samsung Mobile
6.9
CVSS 4.0 · Vendor: SamsungMobile
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Severity by source

Vendor (SamsungMobile) PRIMARY
6.9 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.6 MEDIUM

Local-only exploitation via crafted subtitle file; user interaction required to invoke parser; high integrity from OOB write primitive, low confidentiality and availability impacts.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Sep 09, 2026 - 08:43 vuln.today
CVE Published
Sep 09, 2026 - 04:47 cve.org
MEDIUM 6.9

DescriptionCVE.org

Improper input validation in loading a subtitle frame in libsubextractor.so prior to SMR Sep-2026 Release 1 allows local attackers to write out-of-bounds memory.

AnalysisAI

Out-of-bounds memory write in Samsung's libsubextractor.so subtitle parsing library affects Samsung Mobile Devices running Android 14 through 17, exploitable by a local attacker who induces the device owner to open or play media containing a maliciously crafted subtitle track. The flaw carries a high integrity impact rating consistent with a memory-corruption primitive capable of enabling code execution within the media processing context, patched in the SMR Sep-2026 Release 1 monthly security update. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires local access to a Samsung Mobile Device running Android 14, 15, 16, or 17 with firmware prior to SMR Sep-2026 Release 1. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 (Medium) reflects a local-only attack surface (AV:L) that requires at least passive user interaction (UI:P) - the target must open or play content containing a malicious subtitle track. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: SMR Sep-2026 Release 1, covering Android 14, 15, 16, and 17. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-21088 vulnerability details – vuln.today
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