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Sandbox Escape in WebView in Google Chrome on Android

IdentifiersCVE-2026-12438CWE-693

CVE-2026-12438 is a critical inappropriate implementation vulnerability in WebView in Google Chrome on Android prior to 149.0.7827.155. According to the provided content, a remote attacker who has already compromised the renderer process can use a crafted HTML page to potentially escape the browser sandbox. The issue is described by Chromium as an inappropriate implementation flaw in WebView rather than a memory-safety bug, indicating a failure in security boundary enforcement or isolation logic within the WebView component.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can allow an attacker to break out of the renderer sandbox, defeating a core browser security boundary. In practical terms, this can enable post-compromise escalation from renderer-level code execution to broader access within the browser or app context, and may facilitate further compromise of the underlying system context depending on the surrounding environment and available follow-on primitives.

Mitigation

If you can’t patch tonight, do this now.

No specific temporary workaround is provided in the supplied content. Mitigation is limited to reducing exposure until patching is complete, such as restricting use of untrusted web content in affected Android Chrome/WebView contexts and applying defense-in-depth controls, but the authoritative fix is to update to a patched version.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome on Android / Android WebView to version 149.0.7827.155 or later. Where Chromium is distributed through downstream packages, apply the vendor-fixed builds identified in the supplied advisories, such as Debian chromium 149.0.7827.155-1~deb13u1 for trixie or 149.0.7827.155-1~deb12u1 for bookworm.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
GoogleChromeapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12438
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12438
MITRE CWE · CWE-693
cwe.mitre.org