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Sandbox escape in Google Chrome Metrics

IdentifiersCVE-2026-12465CWE-20

CVE-2026-12465 is a high-severity object lifecycle / insufficient validation of untrusted input vulnerability in the Metrics component of Google Chrome prior to 149.0.7827.155. According to the provided advisory content, a remote attacker who had already compromised the renderer process could leverage a crafted HTML page to potentially escape Chrome's sandbox. The issue is described as affecting object lifecycle handling in Metrics, with related vendor wording also characterizing it as insufficient validation of untrusted input.

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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 let the attacker execute actions outside the intended renderer isolation boundary, materially increasing post-exploitation capability and enabling further compromise of the host or browser context.

Mitigation

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

No specific workaround is provided in the supplied advisories beyond applying the vendor updates. As temporary risk reduction, reduce exposure to malicious web content and untrusted sites, and apply standard browser hardening and exploit-chain disruption controls, but patching is the primary mitigation.

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 upstream 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

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

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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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12465
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12465
MITRE CWE · CWE-20
cwe.mitre.org