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High

Use-after-free in Google Chrome TextEncoding

IdentifiersCVE-2026-3921CWE-416· Use After Free

CVE-2026-3921 is a high-severity use-after-free vulnerability in the TextEncoding component of Google Chrome. It affects Chrome versions prior to 146.0.7680.71. According to the provided content, a remote attacker can trigger the flaw by causing a victim to process a crafted HTML page, leading to heap corruption. The issue is classified by Chromium as High severity and mapped to CWE-416. No further public technical detail about the specific vulnerable function or code path is provided in the supplied content.

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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 corrupt heap memory in the browser process via malicious web content. The provided CVSS v3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) indicates potential for high impact to confidentiality, integrity, and availability. In practice, such a browser memory-corruption flaw could result in browser process compromise, including possible arbitrary code execution or renderer compromise, though the supplied content only explicitly states heap corruption.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting use of untrusted or unknown websites and HTML content, since exploitation requires delivery of a crafted HTML page and user interaction. Enable automatic Chrome updates where possible and restart the browser promptly after updates are installed. However, no mitigation equivalent to patching is provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 146.0.7680.71 or later. The provided content states the vulnerability is fixed in the Chrome 146 stable release for supported platforms, with 146.0.7680.71 listed for Linux and 146.0.7680.71/72 for Windows and macOS. Applying the vendor update and restarting the browser is the recommended 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

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

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 activity3

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-3921
NVD
nvd.nist.gov/vuln/detail/CVE-2026-3921
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/484946544