Padding Overflow Vulnerability in OP-TEE Trusted Execution Environment
CVE-2026-33662

7.5HIGH

Key Information:

Vendor

Op-tee

Status
Optee Os
Vendor
CVE Published:
24 April 2026

What is CVE-2026-33662?

A vulnerability exists in the OP-TEE Trusted Execution Environment related to RSA acceleration. The issue lies in the function emsa_pkcs1_v1_5_encode() where the calculation of the PS size can lead to an integer overflow if a small modulus is chosen. This results in an overflow of the subtraction operation, causing a buffer overflow during padding, which is applied with memset(). This can lead to a crash of the OP-TEE environment, potentially compromising the system's security.

Affected Version(s)

optee_os >= 3.8.0, <= 4.10

References

https://github.com/OP-TEE/optee_os/security/advisories/GH...
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.