Integer overflow in Op-Tee Optee OS
CVE-2026-53763
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. Starting in version 3.0.0 and prior to version 4.11.0, 32-bit integer overflows in OP-TEE core's AES-GCM implementation cause the authentication tag to be computed with incorrect bit-length values after processing more than 512 megabytes of payload or Additional Authenticated Data (AAD). Version 4.11.0 contains a patch. No known workarounds are available.
Vulnerability class: Integer Overflow
EPSS: 0.001 (4.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.8 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N.
Affected products
- Op-tee Optee_os — versions >= 3.0.0, < 4.11.0
- Trustedfirmware Op-tee
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-53763?
- CVE-2026-53763 is a low-severity vulnerability in Op-Tee Optee OS, classified under Integer Overflow or Wraparound. CVSS score: 3.8/10. Published 2026-07-06.
- How severe is CVE-2026-53763?
- Low severity. CVSS v3 base score is 3.8 out of 10.