Is CVE-2026-53763 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-53763?

CVE-2026-53763 has a CVSS v3 severity of LOW (3.8).

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CVE-2026-53763

Description

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.