CVE-2026-45328: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework

This month

CRITICAL 9.3DOWNGRADE

CVE-2026-45328 is a critical-severity flaw (CVSS 9.3) affecting esp-idf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-20, CWE-787
Published	2026-06-10
Last modified	2026-07-23

Publisher (CNA): GitHub, Inc. · Vendor: espressif

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-10 02:16 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

espressif esp-idf DOWNGRADE

Affected: 5.5.4 · 6.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.5.4

1. Check installed version

apt-cache policy esp-idf || rpm -q esp-idf || esp-idf --version

2. No fixed release: DOWNGRADE to a release before 5.5.4 (Debian / Ubuntu)

apt-cache madison esp-idf sudo apt install esp-idf=<VERSION_BEFORE_5.5.4> sudo apt-mark hold esp-idf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list esp-idf sudo dnf downgrade esp-idf-<VERSION_BEFORE_5.5.4> sudo dnf versionlock add esp-idf

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45328?

esp-idf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-45328 being exploited?

CVE-2026-45328 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45328 affect?

CVE-2026-45328 affects esp-idf. Severity is critical (CVSS 9.3). 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 use

How urgent is CVE-2026-45328?

Priority 33/100. Critical severity

Related CVEs

CVE-2026-45541 HIGH 7.5 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
CVE-2026-45542 HIGH 7.1 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
CVE-2026-45160 MEDIUM 6.5 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
CVE-2026-45329 HIGH 7.1 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
CVE-2026-46532 MEDIUM 4.6 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework

References

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