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Critical

Sandbox escape use-after-free in Google Chrome Base on macOS

IdentifiersCVE-2026-9886CWE-416· Use After Free

CVE-2026-9886 is a use-after-free vulnerability in the Base component of Google Chrome affecting macOS versions prior to 148.0.7778.216. According to the provided advisory text, a remote attacker could trigger the flaw by causing a victim to load a crafted HTML page. The vulnerability arises from improper lifetime management of memory in the Base component, leading to access of freed memory. Google classifies the issue as Critical, and the stated consequence is a potential sandbox escape on affected Chrome for Mac installations.

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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 a remote attacker to escape the Chrome sandbox on affected macOS systems. Based on the provided context, exploitation is triggered via a crafted HTML page and could enable compromise beyond the renderer sandbox boundary, increasing the attacker's ability to affect the host environment or chain further post-exploitation actions.

Mitigation

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

No specific temporary workaround is provided in the supplied content. If immediate patching is not possible, reduce exposure by restricting use of untrusted websites and untrusted HTML content on affected macOS Chrome installations, but this does not replace upgrading to a fixed version.

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 builds as they become available. Because Google is limiting technical disclosure until patch adoption improves, the primary remediation is prompt upgrade to the fixed release.
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

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

2 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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-9886
NVD
nvd.nist.gov/vuln/detail/CVE-2026-9886
MITRE CWE · CWE-416
Use After Free
Release Notes
chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
Permissions Required
issues.chromium.org/issues/508456788