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Use-after-free in Google Chrome Extensions

IdentifiersCVE-2026-12445CWE-416

CVE-2026-12445 is a high-severity use-after-free vulnerability in the Extensions component of Google Chrome affecting versions prior to 149.0.7827.155. According to the provided content, the flaw can be triggered via a crafted malicious Chrome extension after an attacker convinces a user to install it. The vulnerability results in a dangling-pointer memory safety condition that can lead to heap corruption during extension handling. Specific vulnerable functions or code paths are not provided in the available source 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 can cause heap corruption in the browser process associated with Chrome Extensions. The provided advisories indicate this may lead to browser compromise and potentially arbitrary code execution in the context of the browser. Broader Chromium downstream advisories also associate this class of issue with denial of service and possible information disclosure depending on exploitability and chaining.

Mitigation

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

Until patched versions are fully deployed, prevent installation of untrusted or suspicious Chrome extensions. In enterprise environments, restrict extension installation using browser policy, allowlist only approved extensions, and limit users to trusted extension sources. Additional defense-in-depth measures such as endpoint protection and browser isolation may reduce risk, but no vendor-provided workaround is described beyond updating.

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 incorporates 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
Microsoft CorporationEdgeapplication

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

ACTIVITY FEED

Recent activity

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

5 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 activity

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12445
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12445
MITRE CWE · CWE-416
cwe.mitre.org