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High

Sandbox escape in Google Chrome UI on Mac

IdentifiersCVE-2026-9885CWE-20· Improper Input Validation

CVE-2026-9885 is an insufficient validation of untrusted input vulnerability in the UI component of Google Chrome on macOS prior to version 148.0.7778.216. According to the provided content, a remote attacker who had already compromised the renderer process could leverage a crafted HTML page to potentially escape Chrome's sandbox. The issue is classified by Chromium as Critical. The available information does not identify the specific vulnerable function or code path beyond the affected UI component and the input-validation weakness.

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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 could allow an attacker to break out of the renderer sandbox on affected Chrome for Mac systems. In practical terms, this can turn a renderer compromise obtained through a malicious web page into execution or actions outside the browser sandbox, increasing the attacker's ability to access system resources and potentially achieve broader system compromise.

Mitigation

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

No specific temporary workaround is provided in the supplied content. The primary mitigation is prompt patching to a fixed Chrome/Chromium build. Until updates are applied, reducing exposure to untrusted web content may lower risk, but this is not presented as a vendor-supported mitigation in the provided material.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome on macOS to version 148.0.7778.216 or later. Where Chromium packages are used downstream, apply the vendor-provided fixed package versions, such as Debian chromium 148.0.7778.215-1~deb12u1 for bookworm or 148.0.7778.215-1~deb13u1 for trixie, as provided in the advisory context.
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

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

1 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

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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-2026-9885
NVD
nvd.nist.gov/vuln/detail/CVE-2026-9885
MITRE CWE · CWE-20
Improper Input Validation
Release Notes
chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
Permissions Required
issues.chromium.org/issues/508452241