{"id":"CVE-2026-71969","title":"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 A…","summary":"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 A…","severity":"medium","cvss":6.7,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-124","CWE-787"],"published":"2026-08-10","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:05:09.813","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71969","references":[{"url":"https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/","label":"disclosure@vulncheck.com"},{"url":"https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3","label":"disclosure@vulncheck.com"},{"url":"https://github.com/OP-TEE/optee_os/pull/7808","label":"disclosure@vulncheck.com"},{"url":"https://github.com/OP-TEE/optee_os/pull/7898","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00182,"epssPercentile":0.06914,"ingestedAt":"2026-09-24T20:51:40.189Z","slug":"CVE-2026-71969","body":"## Overview\n\nOP-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":36.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}