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    CVE-2026-33317

    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. In versions 3.13.0 through 4.10.0, missing checks in `entry_get_attribute_value()` in `ta/pkcs11/src/object.c` can lead to out-of-bounds read from the PKCS#11 TA heap or a crash. When chained with the OOB read, the PKCS#11 TA function `PKCS11_CMD_GET_ATTRIBUTE_VALUE` or `entry_get_attribute_value()` can, with a bad template parameter, be tricked into reading at most 7 bytes beyond the end of the template buffer and writing beyond the end of the template buffer with the content of an attribute value of a PKCS#11 object. Commits e031c4e562023fd9f199e39fd2e85797e4cbdca9, 16926d5a46934c46e6656246b4fc18385a246900, and 149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca contain patches and are anticipated to be part of version 4.11.0.

    Published:Apr 24, 2026
    Last Modified:Jun 5, 2026
    EPS:Apr 24, 2026
    EPSS Score:0.00015
    CVSS Score:8.7

    Affected Products

    Vendor
    Op-tee
    Product
    Op-tee Os
    Vendor
    Trustedfirmware
    Product
    Op-tee

    Exploits

    https://github.com/OP-TEE/optee_os/security/advisories/GHSA-8cqw-mg7v-c9p9https://github.com/0xbbdd/CVE-2026-33317

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-71967 (CVSS 5.7) — OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Wi…
    CVE-2026-53763 (CVSS 3.8) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-44362 (CVSS 5.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-42546 (CVSS 3.8) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41516 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41515 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41514 (CVSS 2.5) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …
    CVE-2026-41434 (CVSS 3.3) — OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High