{"id":"CVE-2026-71969","summary":"OP-TEE OS 4.10.0 Buffer Underwrite via RSA NOPAD Encrypt/Decrypt Operations","details":"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.","modified":"2026-08-15T17:18:46.988573Z","published":"2026-08-10T18:18:43.851Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-124","CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71969.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71969.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71969"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/op-tee-os-buffer-underwrite-via-rsa-nopad-encrypt-decrypt-operations"},{"type":"REPORT","url":"https://github.com/OP-TEE/optee_os/pull/7808"},{"type":"REPORT","url":"https://github.com/OP-TEE/optee_os/pull/7898"},{"type":"FIX","url":"https://github.com/OP-TEE/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"},{"type":"PACKAGE","url":"https://github.com/OP-TEE/optee_os"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/op-tee/optee_os","events":[{"introduced":"0"},{"fixed":"753afbbee1682f5d16fd30e87b31058a4fd4f4b8"},{"fixed":"7b8b494e0a324cefec8ed386b7de413b44f1aaf3"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"4.10.0"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["4.10.0","4.10.0-rc1","4.9.0","4.9.0-rc1","4.8.0","4.8.0-rc1","4.7.0","4.7.0-rc1","4.6.0","4.6.0-rc1","4.5.0","4.5.0-rc1","4.4.0","4.4.0-rc1","4.3.0","4.3.0-rc1","4.2.0","4.2.0-rc1","4.1.0","4.1.0-rc1","4.0.0","4.0.0-rc1","3.22.0","3.22.0-rc1","3.21.0","3.21.0-rc1","3.20.0","3.20.0-rc1","3.19.0","3.19.0-rc1","3.18.0","3.18.0-rc1","3.17.0","3.17.0-rc1","3.16.0","3.15.0","3.15.0-rc1","3.14.0","3.14.0-rc1","3.13.0","3.13.0-rc1","3.12.0","3.12.0-rc1","3.11.0","3.11.0-rc1","3.10.0","3.10.0-rc1","3.9.0","3.9.0-rc1","3.8.0","3.8.0-rc1","3.7.0","3.7.0-rc1","3.6.0","3.6.0-rc1","3.5.0","3.5.0-rc1","3.4.0","3.4.0-rc1","3.3.0","3.3.0-rc2","3.2.0","3.2.0-rc1","3.1.0","3.1.0-rc1","3.0.0","3.0.0-rc2","3.0.0-rc1","2.6.0","2.6.0-rc1","2.5.0","2.5.0-rc2","2.5.0-rc1","2.4.0","2.3.0","2.2.0","20160825-for-lmg","2.1.0","2.0.0","1.1.0","1.0.1","1.0.0","1.0.0-rc2","1.0.0-rc1","0.3.0","0.2.0","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71969.json","vanir_signatures_modified":"2026-08-15T17:18:46Z","vanir_signatures":[{"signature_version":"v1","source":"https://github.com/op-tee/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3","target":{"file":"core/drivers/crypto/crypto_api/acipher/rsa.c","function":"crypto_acipher_rsanopad_encrypt"},"deprecated":false,"digest":{"function_hash":"8593490274038801812299774956013891773","length":1305},"id":"CVE-2026-71969-40879176","signature_type":"Function"},{"signature_version":"v1","source":"https://github.com/op-tee/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3","target":{"file":"core/drivers/crypto/crypto_api/acipher/rsa.c","function":"crypto_acipher_rsanopad_decrypt"},"deprecated":false,"digest":{"function_hash":"84306322295274223870615062802190114626","length":990},"id":"CVE-2026-71969-67a904d1","signature_type":"Function"},{"target":{"file":"core/drivers/crypto/crypto_api/acipher/rsa.c"},"deprecated":false,"digest":{"line_hashes":["270211364791338103468314459693957136595","165326094664678406136139610498641081165","118724124800718350337606844884752223331","92894932607962928401230130311926705564","319129369497590294457666038665529691463","153604258677281153790760704916686388638","173156928024286145726978465812514023469","247753550511696995820956835418065646925"],"threshold":0.9},"id":"CVE-2026-71969-87330acb","signature_type":"Line","signature_version":"v1","source":"https://github.com/op-tee/optee_os/commit/7b8b494e0a324cefec8ed386b7de413b44f1aaf3"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}