CVE-2026-71969
OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations
CVSS Score
6.7
EPSS Score
0.0%
EPSS Percentile
0th
OP-TEE OS through 4.10.0, fixed in commit 7b8b494, contains a buffer underwrite vulnerability in the RSA NOPAD encrypt and decrypt operations within the mbedTLS software backend and SE050 hardware driver that allows a malicious Trusted Application to corrupt secure-world heap memory by supplying an input length exceeding the RSA modulus size. When src_len exceeds rsa_len, the subtraction expression wraps to a large unsigned value, causing a subsequent memcpy to write attacker-controlled data before the destination buffer in S-EL1 secure-world heap memory.
| CWE | CWE-787 CWE-124 |
| Vendor | op-tee |
| Product | optee_os |
| Published | Aug 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
OP-TEE / optee_os
0 ≤ 4.10.0
References
github.com: https://github.com/OP-TEE/optee_os/pull/7898 github.com: https://github.com/OP-TEE/optee_os/pull/7808 github.com: https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3 vulncheck.com: https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations
Credits
Ramtine Tofighi Shirazi (Secmate.dev) Argus Systems - ByteRay Ltd.