CVE-2026-40244
OpenEXR int32 overflow in compressor width*height.
Is CVE-2026-40244 being exploited?
Not confirmed. CVE-2026-40244 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 0.43% probability of exploitation in the next 30 days.
How severe is CVE-2026-40244?
CVE-2026-40244 is rated High with a CVSS score of 8.4. 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-2026-40244?
Yes. A fix has been recorded for CVE-2026-40244. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-40244 affect?
CVE-2026-40244 affects OpenEXR 3.2.0–3.2.7, 3.3.0–3.3.9, 3.4.0–3.4.9. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-40244?
Upgrade to fixed versions: 3.4.10+, 3.3.10, or 3.2.8.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Integer overflow in compressor width*height may cause memory corruption or crash in OpenEXR apps.
Patch when possible
- affected>= 3.2.0 and < 3.2.8
- affected>= 3.3.0 and < 3.3.10
- affected>= 3.4.0 and < 3.4.10
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.