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Samsung Mobile Devices CVE-2026-21091

| EUVDEUVD-2026-74632 MEDIUM
Out-of-bounds Write (CWE-787)
2026-09-09 SamsungMobile GHSA-qcmf-r392-w7x4
4.8
CVSS 4.0 · Vendor: SamsungMobile
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Severity by source

Vendor (SamsungMobile) PRIMARY
4.8 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
5.3 MEDIUM

Local-only vector with low-privilege requirement; limited C/I/A impact consistent with vendor CVSS 4.0 L/L/L rating and no scope change.

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

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

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

Lifecycle Timeline

3
Analysis Generated
Sep 09, 2026 - 08:41 vuln.today
CVSS changed
Sep 09, 2026 - 05:22 NVD
4.4 (MEDIUM) 4.8 (MEDIUM)
CVE Published
Sep 09, 2026 - 04:47 cve.org
MEDIUM 4.8

DescriptionCVE.org

Out-of-bounds write in libcodec2secevrcdec.so prior to SMR Sep-2026 Release 1 allows local attackers to write out-of-bounds memory.

AnalysisAI

Out-of-bounds write in Samsung's libcodec2secevrcdec.so codec library exposes Samsung Mobile Devices running Android 14 through 17 to local memory corruption by low-privileged attackers. The flaw resides in a proprietary secure EVR codec decoder and was addressed in Samsung's SMR Sep-2026 Release 1. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires local execution context on 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 vendor-supplied CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N with base score 4.8) establishes a moderate severity profile: exploitation is strictly local, requires only low-privilege app context, has no special attack requirements, and yields limited L/L/L impact across confidentiality, integrity, and availability of the vulnerable system with no subsequent-system impact. … 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 Apply Samsung SMR Sep-2026 Release 1, which resolves this vulnerability for Android 14, 15, 16, and 17. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Google's Secure Folder prior to the March 2026 SMR release improperly exports Android application components, enabling l

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CVE-2026-21091 vulnerability details – vuln.today

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