Cyber Resilience

CVE-2026-6363

High

Published: 15 April 2026

Published
15 April 2026
Modified
27 May 2026
KEV Added
—
Patch
—
CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0027 19.0th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-6363 is a high-severity Type Confusion (CWE-843) vulnerability in Google Chrome. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Drive-by Compromise (T1189); ranked at the 19.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and SC-18 (Mobile Code).

Deeper analysis

CVE-2026-6363 is a type confusion vulnerability (CWE-843) in the V8 JavaScript engine within Google Chrome versions prior to 147.0.7727.101. It enables a remote attacker to potentially perform out-of-bounds memory access by means of a crafted HTML page. The issue 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 Medium severity by Chromium security.

A remote attacker without privileges can exploit this vulnerability over the network with low complexity by luring a user to interact with a malicious site, such as by visiting a crafted HTML page. Successful exploitation could result in high impacts to confidentiality, integrity, and availability, potentially allowing arbitrary code execution or system compromise through the out-of-bounds memory access.

Google addressed the vulnerability in Chrome stable channel version 147.0.7727.101, as announced in the Chrome Releases blog post (https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop_15.html) and detailed in the Chromium issue tracker (https://issues.chromium.org/issues/495751197). Security practitioners should prioritize updating affected Chrome installations to mitigate the risk.

EU & UK References

Vulnerability details

Type Confusion in V8 in Google Chrome prior to 147.0.7727.101 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page. (Chromium security severity: Medium)

CWE(s)
CWE-843

Related Threats

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?

Type confusion in Chrome V8 enables RCE via crafted HTML page, directly facilitating drive-by compromise (T1189) and client application exploitation (T1203).

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

CVEs Like This One

CVE-2025-2135Same product: Google Chrome
CVE-2026-8540Same product: Google Chrome
CVE-2025-1920Same product: Google Chrome
CVE-2025-0291Same product: Google Chrome
CVE-2025-1914Same product: Google Chrome
CVE-2025-0999Same product: Google Chrome
CVE-2026-2650Same product: Google Chrome
CVE-2026-6359Same product: Google Chrome
CVE-2025-0437Same product: Google Chrome
CVE-2025-1006Same product: Google Chrome

Affected Assets

google
chrome
≤ 147.0.7727.101

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires timely remediation of the type confusion flaw in Chrome's V8 engine by applying the patch released in version 147.0.7727.101.

SI-16 Memory Protection partial match
prevent

Implements memory protection mechanisms such as ASLR and DEP that mitigate out-of-bounds memory access resulting from the V8 type confusion vulnerability.

SC-18 Mobile Code partial match
prevent

Restricts and controls execution of malicious mobile code like JavaScript in crafted HTML pages that exploit the V8 type confusion.

References