Affects widely used Google Chrome on Linux; sandbox escape could enable remote code execution across endpoints.
CVE-2026-12034
Sandbox escape in Chrome on Linux via malicious file in renderer
Is CVE-2026-12034 being exploited?
Not confirmed. CVE-2026-12034 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 0.18% probability of exploitation in the next 30 days.
How severe is CVE-2026-12034?
CVE-2026-12034 is rated High with a CVSS score of 8.3. 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-2026-12034?
Yes. A fix has been recorded for CVE-2026-12034. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12034 affect?
CVE-2026-12034 affects Google Chrome on Linux (Linux desktop) <= 149.0.7827.115. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12034?
Patch to 149.0.7827.115 or newer on Linux
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via sandbox escape from a compromised Linux Chrome renderer when processing a malicious file
Immediate action required
- affected< 149.0.7827.115
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.