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High

Use-after-free in Google Chrome Network

IdentifiersCVE-2026-12012CWE-416· Use After Free

CVE-2026-12012 is a high-severity use-after-free vulnerability in the Network component of Google Chrome and Chromium-based browsers. It affects Google Chrome prior to 149.0.7827.115. The flaw can be triggered via malicious network traffic and results in a use-after-free condition, leading to heap corruption in the browser process or a related network-handling component. Publicly provided details do not identify the specific vulnerable function, and Google indicated that detailed bug information may remain restricted until most users have updated.

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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. According to the available advisories, an attacker in a privileged network position may be able to leverage malicious network traffic to cause browser compromise, potentially including arbitrary code execution, denial of service, or information disclosure. The Chromium advisory explicitly states potential heap corruption; downstream vendor advisories also note possible code execution or broader browser compromise, but precise exploit outcomes are not publicly detailed.

Mitigation

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

No specific workaround or temporary mitigation is provided in the cited advisories. The practical mitigation is to promptly update affected browsers. Until patching is complete, reducing exposure to attacker-controlled or interceptable network paths may lower risk, but this is not a vendor-provided mitigation.

Remediation

Patch, then assume compromise.

Upgrade Google Chrome to version 149.0.7827.115 or later. For Chromium on Debian, apply the vendor security updates: 149.0.7827.114-1~deb12u1 on Debian oldstable (bookworm) or 149.0.7827.114-1~deb13u1 on Debian stable (trixie). For Microsoft Edge (Chromium-based), upgrade to version 149.0.4022.69 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

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

ACTIVITY FEED

Recent activity

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

4 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-2026-12012
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12012
MITRE CWE · CWE-416
Use After Free
Vendor Advisory
chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01962725236.html
Issue Tracking
issues.chromium.org/issues/499182801