CVE-2026-21088

Out-of-bounds write via invalid subtitle frame

Published Sep 9, 2026 · Updated Sep 10, 2026

Improper input validation in Samsung Mobile Devices running Android 14 through 17 allows local users to write out-of-bounds memory. The subtitle-frame loader in libsubextractor.so fails to validate frame data before writing it beyond the intended memory bounds. Triggering requires local access and passive user interaction; the resulting memory corruption affects the vulnerable device only.

CVSS severity6.9
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Samsung Mobile Devices running Android 14 through 17 allows local users to write out-of-bounds memory. The subtitle-frame loader in libsubextractor.so fails to validate frame data before writing it beyond the intended memory bounds. Triggering requires local access and passive user interaction; the resulting memory corruption affects the vulnerable device only.

The record

CVE
CVE-2026-21088
Published
Sep 9, 2026
Updated
Sep 10, 2026
Vendor
Samsung Electronics Co., Ltd.
Product
Samsung Mobile Devices
Classifications
CWE-20, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Samsung Electronics Co., Ltd. · Samsung Mobile DevicesAffected versions are unavailable in this record.

Published CVSS scores

6.9SamsungMobileCVSS: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 describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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