CVE-2026-6785
Memory-safety bugs in Firefox/Thunderbird could allow arbitrary code execution.
Is CVE-2026-6785 being exploited?
Not confirmed. CVE-2026-6785 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 0.51% probability of exploitation in the next 30 days.
How severe is CVE-2026-6785?
CVE-2026-6785 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-2026-6785?
Yes. A fix has been recorded for CVE-2026-6785. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-6785 affect?
CVE-2026-6785 affects Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149, and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-6785?
Patch to latest Firefox/Thunderbird builds
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Memory corruption could enable remote arbitrary code execution via crafted content in Firefox/Thunderbird.
Patch when possible