Secure-world heap corruption via RSA input underwrite
Published Aug 10, 2026 · Updated Aug 10, 2026
Buffer underwrite in OP-TEE OS 4.10.0 and earlier allows attackers controlling a Trusted Application to corrupt secure-world heap memory. The mbedTLS and SE050 RSA NOPAD paths left-align caller input without bounding src_len to the modulus, so unsigned offset subtraction wraps and memcpy writes before the allocated buffer. Reachability requires a Trusted Application able to invoke TEE_ALG_RSA_NOPAD with oversized input; published evidence establishes controlled heap corruption but not code execution.
Summary
What happened
Buffer underwrite in OP-TEE OS 4.10.0 and earlier allows attackers controlling a Trusted Application to corrupt secure-world heap memory. The mbedTLS and SE050 RSA NOPAD paths left-align caller input without bounding src_len to the modulus, so unsigned offset subtraction wraps and memcpy writes before the allocated buffer. Reachability requires a Trusted Application able to invoke TEE_ALG_RSA_NOPAD with oversized input; published evidence establishes controlled heap corruption but not code execution.
The record
- CVE
- CVE-2026-71969
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- OP-TEE
- Product
- OP-TEE OS
- Classifications
- CWE-787, CWE-124
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=4.10.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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