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Sandbox escape use-after-free in Google Chrome Extensions

IdentifiersCVE-2026-12467CWE-416

CVE-2026-12467 is a high-severity use-after-free vulnerability in the Extensions component of Google Chrome affecting versions prior to 149.0.7827.155. The flaw is a memory-safety issue in which freed memory can be reused while still referenced, creating the potential for memory corruption. According to the provided advisory context, a remote attacker who has already compromised the renderer process can trigger the issue via a crafted HTML page and potentially escape Chrome's sandbox. The available content does not identify the specific vulnerable function or code path within Extensions.

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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 who already achieved renderer-process compromise to break out of the browser sandbox. This would materially increase the attacker’s control beyond the renderer, enabling further compromise of the browser environment and potentially facilitating arbitrary code execution in a more privileged context, as well as broader post-exploitation activity depending on the host environment.

Mitigation

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

No specific workaround or temporary mitigation is provided in the supplied advisories beyond upgrading to a fixed version. As a defense-in-depth measure, organizations can reduce exposure by rapidly patching browsers, monitoring for outdated Chrome/Chromium/Edge deployments, and applying browser isolation or endpoint protection controls where appropriate, but these do not replace the vendor fix.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.155 or later. For Chromium on Debian, upgrade to 149.0.7827.155-1~deb13u1 on Debian stable (trixie) or 149.0.7827.155-1~deb12u1 on Debian oldstable (bookworm). For Microsoft Edge (Chromium-based), upgrade to version 149.0.4022.80 or later, which includes the Chromium fix.
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

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

7 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 activity2

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12467
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12467
MITRE CWE · CWE-416
cwe.mitre.org