CVE-2018-9523 Deserialization in Android

What is CVE-2018-9523?

CVE-2018-9523 is a high-severity unsafe deserialization vulnerability in Google Android, published on 14 Nov 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In Parcel.writeMapInternal of Parcel.java, there is a possible parcel serialization/deserialization mismatch due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android. Versions: Android-7.0 Android-7.1.1 Android-7.1.2 Android-8.0 Android-8.1 Android-9. Android ID: A-112859604

Weakness: CWE-20

Which versions are affected by CVE-2018-9523?

It affects 1 product.

Products include Google Android.

How do I fix CVE-2018-9523?

No fix has been published for CVE-2018-9523 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2018-9523 being exploited?

There is no known exploitation of CVE-2018-9523 in the wild and no public exploit code.

Other vulnerabilities in Google Android

• CVE-2026-58704 Google Pixel Improper Authorization Exploited High 8.8
• CVE-2025-48543 Android Runtime Use-After-Free Exploited High 8.8
• CVE-2023-35674 Android Framework Privilege Escalation Exploited High 8.8
• CVE-2025-48595 Android Framework Integer Overflow Exploited High 8.4
• CVE-2024-32896 Android Pixel Privilege Escalation Exploited High 8.1

All Google Android vulnerabilities

Sources

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

Also known as GHSA-8cx7-wfj7-gq4r.