What is CVE-2026-33662?

CVE-2026-33662 is a high-severity vulnerability in Linaro Op-tee, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-04-24.

How severe is CVE-2026-33662?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Linaro Op-tee

CVE-2026-33662

OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. From 3.8.0 to 4.10, in the function emsa_pkcs1_v1_5_encode() in core/drivers/…

Vulnerability class: Integer Overflow

EPSS: 0.001 (27.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linaro Op-tee
Op-tee Optee_os — versions >= 3.8.0, <= 4.10
Trustedfirmware Op-tee

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33662?: CVE-2026-33662 is a high-severity vulnerability in Linaro Op-tee, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-04-24.
How severe is CVE-2026-33662?: High severity. CVSS v3 base score is 7.5 out of 10.