Plaintext recovery via RSA-OAEP timing oracle
Published Jul 6, 2026 · Updated Jul 6, 2026
Observable timing discrepancy in OP-TEE OS 3.9.0 through 4.10.0 allows attackers to recover RSA-OAEP plaintext through chosen ciphertexts. In the NXP CAAM OAEP decoder, early-exit memcmp checks the label hash, a separator scan has variable length, and separate padding-error paths remain observable. Exploitation requires local access to a TEE RSA-OAEP decryption interface on an affected NXP platform configured with the CAAM accelerator and roughly 1,000–2,000 adaptive timing queries.
Summary
What happened
Observable timing discrepancy in OP-TEE OS 3.9.0 through 4.10.0 allows attackers to recover RSA-OAEP plaintext through chosen ciphertexts. In the NXP CAAM OAEP decoder, early-exit memcmp checks the label hash, a separator scan has variable length, and separate padding-error paths remain observable. Exploitation requires local access to a TEE RSA-OAEP decryption interface on an affected NXP platform configured with the CAAM accelerator and roughly 1,000–2,000 adaptive timing queries.
The record
- CVE
- CVE-2026-41515
- Published
- Jul 6, 2026
- Updated
- Jul 6, 2026
- Vendor
- OP-TEE
- Product
- OP-TEE OS
- Classifications
- CWE-208
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 6, 2026CVE publishedPublication date reported by the CVE source.
- Jul 6, 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=>= 3.9.0, < 4.11.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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