CVE-2026-45328

REE-to-TEE code execution via unchecked pointer ranges

Published Jun 10, 2026 · Updated Jun 10, 2026

Out-of-bounds writes in ESP-IDF 5.5.4 and 6.0.1 allow local users running REE code to execute arbitrary code in the TEE. Secure-service wrappers fail to validate output pointers, nested pointers, buffer ends, and 32-bit range overflow before M-mode peripherals write to memory. ESP-TEE must run on a supported RISC-V SoC; corruption can cross the REE/TEE boundary, crash the device, or control TEE execution.

CVSS severity9.3
Critical
EPSS probability0.13%
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 writes in ESP-IDF 5.5.4 and 6.0.1 allow local users running REE code to execute arbitrary code in the TEE. Secure-service wrappers fail to validate output pointers, nested pointers, buffer ends, and 32-bit range overflow before M-mode peripherals write to memory. ESP-TEE must run on a supported RISC-V SoC; corruption can cross the REE/TEE boundary, crash the device, or control TEE execution.

The record

CVE
CVE-2026-45328
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Espressif Systems
Product
ESP-IDF
Classifications
CWE-787, CWE-20, T1068
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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.

  1. Affected versionversion== 5.5.4
  2. Affected versionversion== 6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Espressif Systems · ESP-IDFversion== 5.5.4; version== 6.0

Published CVSS scores

9.3GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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