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Sandbox Escape Race Condition in Google Chrome Safe Browsing on Mac

IdentifiersCVE-2026-12454CWE-362

CVE-2026-12454 is a high-severity race condition in the Safe Browsing component of Google Chrome on macOS prior to version 149.0.7827.155. According to the provided advisory content, a remote attacker who had already compromised the renderer process could exploit the flaw via a crafted HTML page to potentially escape Chrome's sandbox. The vulnerable condition is described only at the component level as a race in Safe Browsing; no specific function or code path is provided in the available material.

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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 would let an attacker who already achieved renderer-process compromise elevate the impact of that foothold beyond the normal browser sandbox boundary, enabling further access to the host context subject to the privileges of the browser process and facilitating exploit chaining.

Mitigation

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

No specific temporary workaround is provided in the supplied advisories. If immediate patching is not possible, reduce exposure by limiting use of untrusted websites, enforcing browser isolation or other defense-in-depth controls, and monitoring for outdated Chrome/Chromium/Edge versions. These measures do not remove the underlying flaw and are only partial risk reduction until the fixed version is deployed.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome on macOS to version 149.0.7827.155 or later. For Chromium downstreams, apply the corresponding fixed Chromium release. Microsoft Edge users should upgrade to version 149.0.4022.80 or later, which incorporates the Chromium fix. Debian Chromium users should install the vendor-fixed packages referenced in the advisory stream.
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
Microsoft CorporationEdgeapplication

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

ACTIVITY FEED

Recent activity

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

6 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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12454
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12454
MITRE CWE · CWE-362
cwe.mitre.org