Cyber Resilience

CVE-2026-9939

HighUpdated

Published: 28 May 2026

Published
28 May 2026
Modified
17 June 2026
KEV Added
—
Patch
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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 0.0041 33.1th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9939 is a high-severity Heap-based Buffer Overflow (CWE-122) 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 33.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Heap buffer overflow in WebCodecs in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

CWE(s)
CWE-122

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?

Heap buffer overflow enables RCE via crafted HTML page (drive-by or client app exploitation).

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

CVEs Like This One

CVE-2026-11124Same product: Apple Macos
CVE-2026-9119Same product: Apple Macos
CVE-2026-5858Same product: Apple Macos
CVE-2026-4448Same product: Apple Macos
CVE-2026-3915Same product: Apple Macos
CVE-2025-10502Same product: Apple Macos
CVE-2026-4463Same product: Apple Macos
CVE-2026-5275Same product: Apple Macos
CVE-2026-9940Same product: Apple Macos
CVE-2026-4442Same product: Apple Macos

Affected Assets

google
chrome
≤ 148.0.7778.216 · ≤ 148.0.7778.215

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References