Chrome is widely used across enterprises; this RCE escaping the sandbox is high-impact and newsworthy, affecting millions of endpoints.
CVE-2026-118355
Remote code execution in Chrome via crafted HTML that escapes the sandbox.
Is CVE-2026-118355 being exploited?
Not confirmed. CVE-2026-118355 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-2026-118355?
CVE-2026-118355 is rated Critical with a CVSS score of 9.6. 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-2026-118355?
Yes. A fix has been recorded for CVE-2026-118355. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-118355 affect?
CVE-2026-118355 affects Google Chrome (desktop) <156.0.8078.73, Chromium-based browsers may be affected. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-118355?
Update Chrome to 156.0.8078.73 or later immediately; deploy via enterprise update tooling.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can execute arbitrary code outside Chrome's sandbox via crafted HTML, enabling system compromise, data theft, or persistence.
Immediate action required
- affected< 156.0.8078.73
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.