CVE-2026-45328
CVE-2026-45328 is a critical-severity vulnerability in Espressif Esp-idf with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: Critical (CVSS 3.x base score 9.3)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-35916
- Weakness: CWE-787
- Affected product: Espressif Esp-idf
- Published:
- Last modified:
Description
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.4 and 6.0, the esp_tee component exposes secure-service wrappers in esp_secure_services.c and esp_secure_services_iram.c that bridge calls from the user application (i.e. the REE) to TEE-protected hardware peripherals (AES, SHA, ECC, HMAC, SPI, MMU, WDT) and to the security feature like attestation, OTA updates, secure storage. This issue has been patched in versions 5.5.5 and 6.0.1.
Frequently asked questions
- What is CVE-2026-45328?
- ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.4 and 6.0, the esp_tee component exposes secure-service wrappers in esp_secure_services.c and esp_secure_services_iram.c that bridge calls from the user application (i.e. the REE) to TEE-protected hardware peripherals (AES, SHA, ECC, HMAC, SPI, MMU, WDT) and to the security feature like attestation, OTA updates, secure storage. This issue has been patched in versions 5.5.5 and 6.0.1.
- How severe is CVE-2026-45328?
- CVE-2026-45328 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-45328 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-45328?
- CVE-2026-45328 primarily affects Espressif Esp-idf. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-45328?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2026-45328 have an EU (EUVD) identifier?
- Yes. CVE-2026-45328 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35916.
- When was CVE-2026-45328 published?
- CVE-2026-45328 was published on 2026-06-10 and last updated on 2026-06-17.
References
- https://github.com/espressif/esp-idf/commit/145ba4c42dc8283054cfde9a1c3470db7399192f
- https://github.com/espressif/esp-idf/commit/440a5d1906502023f2a0fb0aecbdf0602d14acbf
- https://github.com/espressif/esp-idf/commit/764626a1b7c85b943d207da08a2f8f7d7f3def4d
- https://github.com/espressif/esp-idf/commit/7867f4a57560bf9fc4a931e37ba02b7a3e9f406b
- https://github.com/espressif/esp-idf/commit/afd14ab113acd0ca369965404c99ac42e74d4fcd
- https://github.com/espressif/esp-idf/commit/eebabaff2fdc273b1530fe66e55fb3bcd181dfd6
- https://github.com/espressif/esp-idf/security/advisories/GHSA-mmgp-73p4-92xp
Affected products (2)
- cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:*
- cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:*
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