CVE-2026-21003 Security feature bypass in Samsung Mobile Devices

What is CVE-2026-21003?

CVE-2026-21003 is a medium-severity vulnerability in Samsung Android, published on 13 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Improper input validation in data related to network restrictions prior to SMR Apr-2026 Release 1 allows physical attackers to bypass the restrictions.

Which versions are affected by CVE-2026-21003?

It affects 1 product.

Products include Samsung Android.

How do I fix CVE-2026-21003?

No fix has been published for CVE-2026-21003 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-21003 being exploited?

There is no known exploitation of CVE-2026-21003 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Samsung Android

• CVE-2025-21042 Samsung Mobile Devices Out-of-Bounds Write Exploited High 8.8
• CVE-2025-21043 Samsung Mobile Devices Out-of-Bounds Write Exploited High 8.8
• CVE-2021-25487 Samsung Mobile Devices Out-of-Bounds Read Exploited High 7.3
• CVE-2021-25394 Samsung Mobile Devices Race Condition Exploited Medium 6.4
• CVE-2021-25395 Samsung Mobile Devices Race Condition Exploited Medium 6.4

All Samsung Android vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8x4h-8ccm-x267.