CVE-2026-45160: ESF-IDF is the Espressif Internet of Things (IOT) Development Framework

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-45160 is a medium-severity flaw (CVSS 6.5) 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 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1, an out-of-bounds read flaw exists in the DHCP server option parser (parse_options() in components/lwip/apps/dhcpserver/dhcpserver.c) shipped with ESP-IDF's lwIP component. The parser walks the BOOTP/DHCP options field without validating that each option's length byte and declared payload length stay within the received packe

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-125
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: 5.2.7 · 5.3.5 · 5.4.4 · 5.5.4 · 6.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.7

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 5.2.7 (Debian / Ubuntu)

apt-cache madison esp-idf sudo apt install esp-idf=<VERSION_BEFORE_5.2.7> 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_5.2.7> 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-2026-45160?

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

Is CVE-2026-45160 being exploited?

CVE-2026-45160 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-2026-45160 affect?

CVE-2026-45160 affects esp-idf. Severity is medium (CVSS 6.5). ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1, an out-of-bounds read flaw exists in the DHCP server option parser (parse_options() in components/lwip/apps/dhcpserv

How urgent is CVE-2026-45160?

Priority 27/100. No elevated risk signals yet.

Related CVEs

CVE-2026-45541 HIGH 7.5 DOWNGRADE ESF-IDF is the Espressif Internet of Things (IOT) Development Framework
CVE-2026-45328 CRITICAL 9.3 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-2026-45329 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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