CVE-2026-71969 OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations
A malicious Trusted Application can corrupt secure-world heap memory via buffer underwrite in RSA operations, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71969?
CVE-2026-71969 is a high-severity memory corruption vulnerability in OP-TEE optee_os, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-71969?
How do I fix CVE-2026-71969?
No fix has been published for CVE-2026-71969 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-71969 being exploited?
There is no known exploitation of CVE-2026-71969 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-71969, GHSA-hg7c-pmh6-576f, UBUNTU-CVE-2026-71969.