CVE-2026-21087 Memory corruption in Samsung Mobile Devices

What is CVE-2026-21087?

CVE-2026-21087 is a high-severity memory corruption vulnerability in Samsung Android, published on 9 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege.

Weakness: CWE-787

Which versions are affected by CVE-2026-21087?

It affects 1 product.

Products include Samsung Android.

How do I fix CVE-2026-21087?

No fix has been published for CVE-2026-21087 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-21087 being exploited?

There is no known exploitation of CVE-2026-21087 in the wild and no public exploit code.

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-76j3-93c5-24hp.