---
cve: "CVE-2026-71969"
severity: "HIGH"
cvss: 8.4
epss: "0.1%"
vendor: "OP-TEE"
kev: false
exploited: false
published: "2026-08-10 19:17:32"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T12:23:42+02:00"
---

# CVE-2026-71969

> 8.4 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 753afbbee1682f5d16fd30e87b31058a4fd4f4b8 (Commit)
- 7b8b494e0a324cefec8ed386b7de413b44f1aaf3 (Commit)

## Referenzen

- <https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/>
- <https://github.com/OP-TEE/optee_os/pull/7898>
- <https://github.com/OP-TEE/optee_os/pull/7808>
- <https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3>
- <https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71969) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_