Affects Google Chrome—ubiquitous browser used across organizations; exploitation can impact many endpoints and enterprise operations.
CVE-2026-17666
Crypto flaw in Chrome allows access-control bypass via malicious network traffic
Is CVE-2026-17666 being exploited?
Not confirmed. CVE-2026-17666 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. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-17666?
CVE-2026-17666 is rated Critical with a CVSS score of 9.1. 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-2026-17666?
Yes. A fix has been recorded for CVE-2026-17666. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-17666 affect?
CVE-2026-17666 affects Google Chrome <151.0.7922.72 (Windows/macOS/Linux/ChromeOS). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-17666?
Update Chrome to 151.0.7922.72 or later; isolate/restrict untrusted network access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Attacker in a privileged network position can bypass Chrome discretionary access controls to access/manipulate protected resources, leading to data disclosure and privilege escalation.
Immediate action required
- affected< 151.0.7922.72
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.