CVE-2026-33317

Secret-key disclosure and heap corruption via unchecked templates

Published Apr 24, 2026 · Updated Apr 24, 2026

Out-of-bounds access in OP-TEE OS 3.13.0 through 4.10.0 allows local users to disclose PKCS#11 TA heap data or crash the TA. In entry_get_attribute_value() in ta/pkcs11/src/object.c, unchecked output and attribute lengths let a crafted template drive TEE_MemMove past buffer boundaries. Low-privileged local access to PKCS11_CMD_GET_ATTRIBUTE_VALUE is required; exposure includes residual secret keys, TA heap corruption, and a TA crash.

CVSS severity8.7
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in OP-TEE OS 3.13.0 through 4.10.0 allows local users to disclose PKCS#11 TA heap data or crash the TA. In entry_get_attribute_value() in ta/pkcs11/src/object.c, unchecked output and attribute lengths let a crafted template drive TEE_MemMove past buffer boundaries. Low-privileged local access to PKCS11_CMD_GET_ATTRIBUTE_VALUE is required; exposure includes residual secret keys, TA heap corruption, and a TA crash.

The record

CVE
CVE-2026-33317
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
OP-TEE
Product
OP-TEE OS
Classifications
CWE-125, CWE-787, T1212
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=>= 3.13.0, <= 4.10.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OP-TEE · OP-TEE OSversion=>= 3.13.0, <= 4.10.0

Published CVSS scores

8.7GitHubCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write
T1212Exploitation for Credential Access

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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