CVE-2026-10020: Chrome Android Sandbox Escape via Skia Input Validation Flaw

Technical summary

CVE-2026-10020 stems from insufficient input validation in Skia, Chrome's rendering engine, when processing untrusted data. An attacker controlling the compromised renderer process can craft a malicious HTML page that triggers an out-of-bounds condition or memory corruption in Skia's code path. This allows the attacker to break out of the sandbox isolation that normally restricts Chrome renderer processes, escalating to system-level privileges on the Android device. The vulnerability is classified as CWE-20 (Improper Input Validation). Google assigned it Medium severity internally, though the CVSS v3.1 score of 8.3 reflects the high confidentiality, integrity, and availability impact when successfully exploited.

Business impact

For enterprise environments deploying Chrome on Android devices, this vulnerability poses a risk primarily in targeted attack scenarios. An attacker would first need to compromise the renderer (via another bug or watering-hole attack), then use this sandbox escape to access sensitive data, install malware, or move laterally within corporate networks. Organizations managing Android deployments should assess whether Chrome is a primary threat vector in their threat model and whether their users' threat profile warrants urgent patching. Unmanaged personal devices may face lower organizational risk but higher individual user risk.

Affected systems

Google Chrome on Android versions prior to 148.0.7778.216 are vulnerable. The underlying Android platform is listed as an affected vendor, though the vulnerability is specific to Chrome's Skia implementation rather than Android OS itself. Desktop and other platform versions of Chrome are not affected by this particular flaw. Organizations should verify Chrome version numbers across their Android fleet; version 148.0.7778.216 and later contain the fix.

Exploitability

Exploitation requires a two-stage attack: first compromising Chrome's renderer process (via a separate vulnerability or social engineering), then delivering the crafted HTML page to trigger the sandbox escape. The CVSS vector 'AC:H' (high attack complexity) and 'UI:R' (user interaction required) reflect these constraints. While not a one-click remote code execution, the impact is severe once the renderer is compromised. No public exploits are known or tracked in the CISA KEV catalog, but the design is such that a motivated attacker with capability and access to the renderer could develop working code.

Remediation

Update Google Chrome on Android to version 148.0.7778.216 or later. Organizations using mobile device management (MDM) solutions should deploy this update to managed Android devices as a priority. For unmanaged or BYOD environments, consider user communication campaigns to encourage immediate updates. Verify completion by checking Chrome version numbers in Settings > About Chrome on affected devices.

Patch guidance

Google released the fix in Chrome 148.0.7778.216. Organizations should follow their standard patch management process: test the update in a non-production environment if feasible, then roll out to all Android devices via MDM or user-directed updates. The update addresses the root cause of insufficient input validation in Skia, so no workarounds are recommended. Given the sandbox-escape nature, this patch should be treated as important rather than deferrable.

Detection guidance

Monitor for unexpected sandbox escapes or privilege elevation attempts on Android devices. EDR or MDM solutions with behavioral analysis may detect process behavior consistent with sandbox escape (e.g., renderer process spawning system-level commands). Check Chrome version numbers via MDM telemetry or device inventory tools to identify unpatched systems. Log and alert on failed or delayed Chrome updates in your fleet.

Why prioritize this

Although not yet in the CISA Known Exploited Vulnerabilities catalog, this sandbox-escape flaw merits prompt attention because: (1) it bridges from the renderer (a frequently compromised process) to system access; (2) Android is a common attack surface in BYOD and enterprise environments; and (3) the CVSS 8.3 score reflects high impact. Organizations with significant Android Chrome usage should prioritize within 30 days; others may follow standard patching cycles.

Risk score, explained

CVSS 8.3 (HIGH) reflects the worst-case scenario: an attacker who has compromised the renderer can fully escape the sandbox (C:H, I:H, A:H) and potentially access the entire device. The 'AC:H' and 'UI:R' components reduce it from Critical because the initial renderer compromise is a prerequisite and user action is needed. The 'S:C' (scope changed) indicates that impact extends beyond the vulnerable component to the broader system.

Frequently asked questions