CVE-2026-0880
Sandbox escape via integer overflow in Firefox graphics component.
Is CVE-2026-0880 being exploited?
Not confirmed. CVE-2026-0880 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 0.66% probability of exploitation in the next 30 days.
How severe is CVE-2026-0880?
CVE-2026-0880 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-2026-0880?
Yes. A fix has been recorded for CVE-2026-0880. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-0880 affect?
CVE-2026-0880 affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-0880?
Update Firefox to patched release immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Sandbox escape could lead to code execution via graphics overflow in Firefox (<147, ESR <115.32/140.7).
Patch when possible