CVE-2026-2805
Critical DOM pointer bug in Firefox <148 and Thunderbird <148.
Is CVE-2026-2805 being exploited?
Not confirmed. CVE-2026-2805 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 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-2805?
CVE-2026-2805 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-2026-2805?
Yes. A fix has been recorded for CVE-2026-2805. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-2805 affect?
CVE-2026-2805 affects Mozilla Firefox < 148, Mozilla Thunderbird < 148. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-2805?
Update to Firefox/Thunderbird 148+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE via invalid DOM pointer in Core/HTML; attacker can run arbitrary code in the browser context.
Immediate action required