PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-21125 Samsung Mobile CVE debrief

CVE-2026-21125 is a high-severity vulnerability in Samsung Mobile Devices due to improper input validation in parsing sheifd in libsimba.heifdec.media.samsung.so prior to SMR Oct-2026 Release 1. This allows local attackers to potentially execute arbitrary code. The vulnerability affects Samsung Mobile Devices. Official CVE Program and NVD records provide details. Defenders should assess exposure and apply remediation based on vendor guidance and affected scope. The vulnerability requires verification and remediation to prevent potential local attacks.

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 should assess exposure and apply remediation based on vendor guidance and affected scope. This includes verifying device configurations, ensuring proper input validation, and monitoring for potential local attacks. Security teams and vulnerability management teams should prioritize remediation efforts for affected devices.

Why it matters

CVE-2026-21125 is a high-severity vulnerability in Samsung Mobile Devices that requires verification and remediation to prevent potential local attacks.

  • Potential arbitrary code execution by local attackers
  • Verification of device configurations and input validation
  • Remediation priority for affected Samsung Mobile Devices

Technical summary

The vulnerability is due to improper input validation in parsing sheifd in libsimba.heifdec.media.samsung.so prior to SMR Oct-2026 Release 1. This allows local attackers to potentially execute arbitrary code. The affected product is Samsung Mobile Devices. Defenders should prioritize verifying exposure and applying vendor-provided remediation. Technical details are based on official CVE Program and NVD records.

Defensive priority

Defenders should prioritize verifying exposure in Samsung Mobile Devices and applying vendor-provided remediation.

Recommended defensive actions

  • Verify Samsung Mobile Devices are up to date with the latest security patches
  • Review device configurations to ensure proper input validation
  • Monitor for potential local attacks

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Samsung Mobile Devices are affected, but specific version details are limited. Defenders should verify exposure and apply remediation based on vendor guidance. The CVE record was published on 2026-10-12T04:57:41.717Z and has not been modified since then. Evidence is based on CVE Program and NVD records.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-21125 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-21125

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

  • CVE-2026-21125 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-21125

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

Supplemental references

  • CVE-2026-21125

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21125.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.