CVE-2026-12293
Use-after-free in WebGPU graphics (Firefox/Thunderbird) fixed in v152
Is CVE-2026-12293 being exploited?
Not confirmed. CVE-2026-12293 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 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-12293?
CVE-2026-12293 is rated Critical with a CVSS score of 9.8. 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-2026-12293?
Yes. A fix has been recorded for CVE-2026-12293. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12293 affect?
CVE-2026-12293 affects Firefox 152, Thunderbird 152. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12293?
Update to Firefox 152 and Thunderbird 152 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Memory corruption in WebGPU could crash or enable RCE via crafted content in browser
Immediate action required