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CVE-2026-33317— OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure

Quick assessment

Affected
OP-TEE optee_os
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OP-TEE Trusted OS是OP-TEE开源的一个实现 Arm TrustZone 技术的开源可信执行环境（TEE）。 OP-TEE Trusted OS 3.13.0版本至4.10.0版本存在缓冲区错误漏洞，该漏洞源于entry_get_attribute_value()函数中缺少检查，可能导致PKCS#11 TA堆越界读取或崩溃。

CVSS 8.7 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33317

Vulnerability Information
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Vulnerability Title
OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure
Source: CVE Program / CVE List V5
Vulnerability 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. 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
OP-TEE Trusted OS 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OP-TEE Trusted OS是OP-TEE开源的一个实现 Arm TrustZone 技术的开源可信执行环境（TEE）。 OP-TEE Trusted OS 3.13.0版本至4.10.0版本存在缓冲区错误漏洞，该漏洞源于entry_get_attribute_value()函数中缺少检查，可能导致PKCS#11 TA堆越界读取或崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OP-TEE optee_os >= 3.13.0, <= 4.10.0 -

II. Public POCs for CVE-2026-33317

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III. Intelligence Information for CVE-2026-33317

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Vendor Advisories for CVE-2026-33317 (1)

IV. Related Vulnerabilities

Same product: optee_os
Same vendor: OP-TEE
Same weakness: CWE-125

V. Comments for CVE-2026-33317

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