Widespread browser (Google Chrome) vulnerability enabling site-isolation bypass and cross-origin data exposure; affects many organizations and requires prompt remediation.
CVE-2026-106271
Chrome Workers auth bypass lets compromised renderer bypass site isolation via crafted PDF
Is CVE-2026-106271 being exploited?
Not confirmed. CVE-2026-106271 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 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-106271?
CVE-2026-106271 is rated High with a CVSS score of 8.1. 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-2026-106271?
Yes. A fix has been recorded for CVE-2026-106271. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-106271 affect?
CVE-2026-106271 affects Google Chrome < 155.0.8059.39 (Desktop). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-106271?
Update Chrome to 155.0.8059.39+ immediately; restrict untrusted PDFs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A compromised renderer plus crafted PDF can bypass site isolation to read/exfiltrate cross-origin data and tokens.
Immediate action required
- affected< 155.0.8059.39
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.