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CVE-2026-33317

OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure

Published: Apr 24, 2026Updated: Jun 5, 2026 Sources: CVE List NVDCWE-125
NVD MITRE
8.7CVSSHIGH
EPSS Score
0.2%
Top 92.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:CC:HI:HA:L
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-125CWE-787

Affected Products

op-teetrustedfirmware
On-prem
Security Products / pki-crypto
optee_osOP-TEE
Embedded
Operating Systems / rtos-embedded-os
trustedfirmwarecommercialSecurity Productsaka mbed tls, op-tee, trusted firmware-a
op-teeoss-projectOperating Systemsaka optee, op-tee os

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/OP-TEE/optee_os/commit/149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca
github.com
https://github.com/OP-TEE/optee_os/commit/16926d5a46934c46e6656246b4fc18385a246900
github.com
https://github.com/OP-TEE/optee_os/commit/e031c4e562023fd9f199e39fd2e85797e4cbdca9
github.com
and 1 more references View all →

Timeline

Published
Apr 24, 2026
Last Updated
Jun 5, 2026

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