Buffer overflow in Insyde Software Insydeh2o

CVE-2026-9805

SMM IHISI command handler, FMTSWriteUseIntelLib, for FMTS command 0x32, read and write data without checking buffer size and could cause buffer overflow.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.001 (2.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-9805: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-9805?
CVE-2026-9805 is a low-severity vulnerability in Insyde Software Insydeh2o, classified under Out-of-bounds Write. CVSS score: 2.7/10. Published 2026-08-26.
How severe is CVE-2026-9805?
Low severity. CVSS v3 base score is 2.7 out of 10.