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CVE-2026-21124 Samsung Mobile CVE debrief

PatchSiren debrief for CVE-2026-21124: Improper input validation in getting cover image in libsimba.heifdec.media.samsung.so prior to SMR Oct-2026 Release 1 allows local attackers to potentially execute arbitrary code. This HIGH-severity vulnerability affects Samsung Mobile Devices and requires immediate attention from defenders to prevent potential arbitrary code execution by local attackers. The vulnerability is caused by improper input validation when getting cover images, and defenders should prioritize verifying and applying the October 2026 security update for Samsung Mobile Devices. The CVE Program and NVD records indicate improper input validation in libsimba.heifdec.media.

Vendor
Samsung Mobile
Product
Samsung Mobile Devices
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-12
Original CVE updated
2026-10-12
Advisory published
2026-10-12
Advisory updated
2026-10-12

Who should care

Defenders responsible for Samsung Mobile Devices, particularly those managing local security and software updates, should assess exposure and prioritize applying the October 2026 security update.

Why it matters

CVE-2026-21124 is a HIGH-severity vulnerability in Samsung Mobile Devices that requires immediate attention from defenders to prevent potential arbitrary code execution by local attackers.

  • Potential arbitrary code execution by local attackers
  • Need for verification and application of security updates
  • Inventory and monitoring of affected Samsung Mobile Devices

Technical summary

CVE-2026-21124 is a HIGH-severity vulnerability in libsimba.heifdec.media.samsung.so on Samsung Mobile Devices prior to SMR Oct-2026 Release 1. The vulnerability allows local attackers to potentially execute arbitrary code due to improper input validation when getting cover images.

Defensive priority

Defenders should prioritize verifying and applying the October 2026 security update for Samsung Mobile Devices to prevent potential arbitrary code execution.

Recommended defensive actions

  • Verify and apply the October 2026 security update for Samsung Mobile Devices
  • Inventory Samsung Mobile Devices for potential exposure
  • Monitor for local attacks attempting arbitrary code execution

Evidence notes

The CVE Program and NVD records indicate improper input validation in libsimba.heifdec.media.samsung.so prior to SMR Oct-2026 Release 1. Samsung Mobile Devices are affected.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-21124 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-21124

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-21124 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-21124

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-21124

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21124.json

    cve_program_cvelist_v5

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.