{"affected":[{"defaultStatus":"affected","ecosystem":"github","packageName":"OP-TEE/optee_os","product":"optee_os","source":"CNA: VulnCheck","vendor":"OP-TEE","versions":[{"lessThanOrEqual":"4.10.0","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"7b8b494e0a324cefec8ed386b7de413b44f1aaf3","versionType":"git"}]}],"cveId":"CVE-2026-71969","cwes":["CWE-787","CWE-124"],"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.","epss":{"date":"2026-11-08","percentile":0.07885,"score":0.00182},"exploits":[{"kind":"exploit","source":"CNA: VulnCheck","url":"https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/"}],"kev":null,"metrics":[{"score":8.4,"severity":"high","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":6.7,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1794146917360,"publishedAt":1786385923851,"references":[{"source":"CNA: VulnCheck","tags":["technical-description","exploit"],"url":"https://blog.secmate.dev/posts/optee-vulnerabilities-disclosure/"},{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/OP-TEE/optee_os/pull/7898"},{"source":"CNA: VulnCheck","tags":["issue-tracking","patch"],"url":"https://github.com/OP-TEE/optee_os/pull/7808"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/OP-TEE/optee_os/pull/7898"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/OP-TEE/optee_os/pull/7808"},{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"}],"revision":"7a0a3ce264202347052d2d889ba23af090f187a54010db2bdd468a3528ea1f90","sources":[{"modifiedAt":1794146917360,"name":"CNA: VulnCheck","retrievedAt":1794151330429,"url":"https://www.cve.org/CVERecord?id=CVE-2026-71969"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794151337578,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-71969"}],"ssvc":{"assessedAt":1786391262914,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations","updatedAt":1794151337578}