CVE-2026-3539
Heap corruption in Chrome DevTools via malicious extension.
Is CVE-2026-3539 being exploited?
Not confirmed. CVE-2026-3539 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-3539?
CVE-2026-3539 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-3539?
Yes. A fix has been recorded for CVE-2026-3539. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-3539 affect?
CVE-2026-3539 affects Google Chrome, Chrome DevTools (pre-145.0.7632.159). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-3539?
Update to 145.0.7632.159 or newer.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Heap corruption could enable arbitrary code execution in Chrome via a crafted extension installed by a user.
Immediate action required