CVE-2026-0069: Android Resource Exhaustion in APK Signature Verification

Technical summary

The vulnerability exists in the verifySignature method of ApkChecksums.java within Google Android. The flaw stems from insufficient resource limits during cryptographic signature validation (CWE-400: Uncontrolled Resource Consumption). A local, low-privileged process can submit specially crafted input that forces the verification routine to consume excessive memory or CPU cycles, eventually exhausting system resources and triggering a crash. The attack requires only local access and no elevated privileges.

Business impact

This vulnerability impacts device availability and reliability. Affected users may experience unexpected crashes, service interruptions, and degraded performance. In enterprise deployments where Android devices handle critical workloads, repeated exploitation could disrupt operations. The local-only attack surface and requirement for existing device access limit the immediate threat scope, but persistent crashing could affect user trust and support costs.

Affected systems

Google Android is the confirmed affected vendor and product. The exact affected Android versions are not specified in the advisory; organizations should consult the official Google Android Security Bulletin for June 2026 to confirm which OS versions and devices are impacted and determine scope within their environment.

Exploitability

Exploitation requires local access to an Android device and low user privileges. No special elevation, user interaction, or network connectivity is needed once the attacker can execute code locally. The attack is straightforward to trigger—a malicious application or compromised system process can invoke the vulnerable code path. However, the local-only requirement significantly limits real-world attack scope compared to remote exploits.

Remediation

Apply the security patch released by Google for Android in June 2026. Organizations should prioritize this update for devices in use, particularly in enterprise environments. After patching, verify that affected services have restarted cleanly. No workarounds are known; patching is the primary mitigation.

Patch guidance

Monitor Google's official Android Security & Privacy page and your device manufacturer's support channels for CVE-2026-0069 patches. Patches are typically distributed as monthly security updates. Test updates in a non-production environment before full rollout to ensure compatibility with your application stack. Verify against the vendor advisory that the patch version you deploy explicitly addresses this CVE. OEM devices may lag behind Pixel updates, so confirm deployment timelines with your device supplier.

Detection guidance

Monitor system logs for unexpected crashes or service restarts involving APK verification or signature validation processes. Elevated memory or CPU usage correlating with verification operations may indicate exploitation attempts. On devices with security monitoring enabled, watch for repeated failures in the signature verification subsystem. Behavioral detection of resource exhaustion tied to app installation or package scanning can reveal active exploitation.

Why prioritize this

While this is a MEDIUM severity vulnerability (CVSS 5.5), it warrants prompt attention because it requires no user interaction and can be exploited by any local process. Unpatched devices remain vulnerable to availability attacks that could disrupt critical operations. The low barrier to exploitation—combined with the fact that local access is common in multi-user or compromised environments—justifies prioritizing this patch in your deployment schedule.

Risk score, explained

CVSS 5.5 reflects the attack vector (local only), low complexity, and low privilege requirement (AV:L, AC:L, PR:L), which lower the score relative to a remote exploit. However, the high impact on availability (A:H) and lack of confidentiality or integrity impact (C:N, I:N) result in a MEDIUM rating. The absence of user interaction (UI:N) and the single-system scope (S:U) keep the score in the moderate range rather than high.

Frequently asked questions