CVE-2026-41516

Plaintext recovery via variable-time padding validation

Published Jul 6, 2026 · Updated Jul 6, 2026

Information disclosure in OP-TEE OS 4.5.0 through 4.10.x allows local users to recover RSA PKCS#1 v1.5 plaintext via a timing oracle. The rsaes_pkcs_v1_5_decode() routine returns early for distinct padding failures and scans for the separator with input-dependent runtime. Reachability requires plat-d06 with the HPRE driver enabled, access to a decryption interface, and roughly 1,000–2,000 chosen-ciphertext requests; the driver is disabled by default.

CVSS severity2.5
Low
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in OP-TEE OS 4.5.0 through 4.10.x allows local users to recover RSA PKCS#1 v1.5 plaintext via a timing oracle. The rsaes_pkcs_v1_5_decode() routine returns early for distinct padding failures and scans for the separator with input-dependent runtime. Reachability requires plat-d06 with the HPRE driver enabled, access to a decryption interface, and roughly 1,000–2,000 chosen-ciphertext requests; the driver is disabled by default.

The record

CVE
CVE-2026-41516
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

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. 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.

  1. Affected versionversion=>= 4.5.0, < 4.11.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OP-TEE · OP-TEE OSversion=>= 4.5.0, < 4.11.0

Published CVSS scores

2.5GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-208Observable Timing Discrepancy

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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