CVE-2026-74969
Use-after-free in Firefox/Thunderbird layout text/fonts enabling potential remote code execution.
Is CVE-2026-74969 being exploited?
Not confirmed. CVE-2026-74969 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 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-74969?
CVE-2026-74969 is rated High with a CVSS score of 8.8. 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-2026-74969?
Yes. A fix has been recorded for CVE-2026-74969. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74969 affect?
CVE-2026-74969 affects Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, and 3 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74969?
Update affected Firefox/Thunderbird to the listed fixed versions immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Use-after-free in text/font layout can be triggered by crafted content to crash or achieve remote code execution in the browser/agent.
Patch when possible