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Use-after-free in Google Chrome Tab Strip

IdentifiersCVE-2026-12455CWE-416

CVE-2026-12455 is a high-severity use-after-free vulnerability in the Tab Strip component of Google Chrome prior to 149.0.7827.155. According to the provided advisory content, a remote attacker can trigger the flaw by luring a victim to a crafted HTML page and convincing the user to perform specific UI gestures. The resulting stale object access can lead to heap corruption in the browser process. The issue affects Chromium-based browsers inheriting the vulnerable codebase, including Google Chrome and Microsoft Edge, until they are updated to fixed releases.

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For your environment

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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, which may result in browser process compromise, denial of service via crash, or potentially arbitrary code execution in the context of the logged-in user. The broader vendor context also notes that Chromium vulnerabilities of this class may contribute to remote code execution, security restriction bypass, or information disclosure depending on exploit reliability and chaining.

Mitigation

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

No vendor-provided workaround is described beyond patching. Until updates are applied, reduce exposure by limiting access to untrusted or suspicious websites, minimizing interaction with attacker-controlled HTML content, and applying enterprise browser hardening measures such as restricting risky browsing workflows and monitoring for outdated Chromium-based browser versions.

Remediation

Patch, then assume compromise.

Update Google Chrome to version 149.0.7827.155 or later. For Microsoft Edge (Chromium-based), update to version 149.0.4022.80 or later, which incorporates the upstream Chromium fix. Debian users should install the fixed chromium packages: 149.0.7827.155-1~deb13u1 for Debian stable (trixie) or 149.0.7827.155-1~deb12u1 for Debian oldstable (bookworm).
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

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 activity1

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12455
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12455
MITRE CWE · CWE-416
cwe.mitre.org