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High

Use-after-free in Google Chrome Extensions

IdentifiersCVE-2026-3919CWE-416· Use After Free

CVE-2026-3919 is a high-severity use-after-free vulnerability in the Extensions component of Google Chrome affecting versions prior to 146.0.7680.71. According to the provided content, exploitation requires an attacker to convince a user to install a malicious extension, after which a crafted HTML page can trigger the flaw and cause heap corruption. The issue is classified by Chromium as CWE-416 (Use After Free). While the specific vulnerable function is not identified in the provided material, the bug condition indicates improper lifetime management of an object in the Extensions subsystem, creating a memory-safety condition that can be abused during page processing.

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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 result in heap corruption in the browser process or affected component context. Based on the provided CVSS vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), the vulnerability may enable high-impact compromise of confidentiality, integrity, and availability. In practical terms, this can include browser compromise, potential arbitrary code execution, application instability or crash, and abuse of the malicious extension plus crafted page combination to execute attacker-controlled actions in the victim's browser context.

Mitigation

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

Until patching is completed, reduce exposure by preventing installation of untrusted or unnecessary browser extensions, enforcing extension allowlisting through enterprise policy where possible, and restricting users from installing extensions from unverified sources. Users should avoid interacting with untrusted or attacker-supplied HTML content, especially in environments where extension installation is not tightly controlled. Because Google is limiting technical disclosure until broad patch adoption, prompt update deployment is the most effective mitigation.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 146.0.7680.71 or later on affected platforms. The provided content indicates that Google released Chrome 146 to the stable channel for Windows, macOS, and Linux and that this vulnerability is fixed in that release. Applying the vendor update and restarting the browser is the primary remediation.
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 activity4

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-3919
NVD
nvd.nist.gov/vuln/detail/CVE-2026-3919
MITRE CWE · CWE-416
Use After Free
Vendor Advisory
chromereleases.googleblog.com/2026/03/stable-channel-update-for-desktop_10.html
Permissions Required
issues.chromium.org/issues/444176961