Cyber Posture

CVE-2026-5861

High

Published: 08 April 2026

Published
08 April 2026
Modified
13 April 2026
KEV Added
—
Patch
—
CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0014 33.5th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Description

Use after free in V8 in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match
prevent

Directly requires timely identification, reporting, prioritization, and remediation of flaws like the use-after-free vulnerability in Chrome's V8 engine via patching to version 147.0.7727.55 or later.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Mandates vulnerability scanning to identify systems running vulnerable Chrome versions affected by CVE-2026-5861 prior to exploitation.

SI-16 Memory Protection partial match
prevent

Implements memory protection mechanisms that mitigate use-after-free exploits by restricting unauthorized code execution within the browser sandbox.

Security SummaryAI

CVE-2026-5861 is a use-after-free vulnerability (CWE-416) in the V8 JavaScript engine within Google Chrome versions prior to 147.0.7727.55. Published on 2026-04-08, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and is rated High severity by Chromium security standards.

A remote attacker can exploit this flaw by crafting an HTML page that, when loaded by a user in an affected Chrome browser, triggers the use-after-free condition in V8. This enables arbitrary code execution confined within the browser's sandbox, potentially compromising the user's system depending on further exploitation chains.

Mitigation is available via the Google Chrome stable channel update for desktop, which patches the issue in version 147.0.7727.55 and later, as announced at https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html. Additional details are provided in the Chromium issue tracker at https://issues.chromium.org/issues/486927780. Security practitioners should prioritize updating affected browsers.

Details

CWE(s)
CWE-416

Affected Products

google
chrome
≤ 147.0.7727.55

MITRE ATT&CK Enterprise TechniquesAI

T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Why these techniques?

The vulnerability is a use-after-free in Chrome's V8 engine exploitable via a crafted HTML page, enabling drive-by compromise (T1189) and client-side exploitation for code execution (T1203).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

References