Medium 6.5Published Jun 9, 2026

CVE-2026-45160ESF-IDF: Out-of-bounds Read in lwIP DHCP Server Option Parser

Updated under an hour ago (Oct 27, 2026, 10:23 AM ET)

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Every CVE for espressif esp-idf

Exploited in the last 30 days

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 packet buffer. A crafted DHCP request can cause the parser to read past the end of the options buffer into adjacent heap memory. The issue affects the DHCP server used by ESP-IDF's SoftAP and any configuration where the device runs as a DHCP server on a local network. This issue has been patched in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.2.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jun 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

espressif esp-idf espressif:esp_idf (from the name)	= 5.2.7; = 5.3.5; = 5.4.4; = 5.5.4; = 6.0.1	CNA record
espressif esp-idf espressif:esp-idf	5.2.7; 5.3.5; 5.4.4; 5.5.4; 6.0.1	NVD

References

References

https://github.com/espressif/esp-idf/security/advisories/GHSA-g764-gwc3-75m5	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/espressif/esp-idf/commit/2bf4dd12002dbae60a4b21abff010ecb2b8ee82b	x-refsource-misc, patch
https://github.com/espressif/esp-idf/commit/2da2db43fd7e0bcff9e7b95f54f388296bb6f911	x-refsource-misc, patch
https://github.com/espressif/esp-idf/commit/8b4b5d5301815198d177974ffc24848f47748248	x-refsource-misc, patch
https://github.com/espressif/esp-idf/commit/9f713dbc94982d917f2d12964b233cd9efa4aeba	x-refsource-misc, patch
https://github.com/espressif/esp-idf/commit/d51b1076092487e533eadf8b48c9c8579d3a6712	x-refsource-misc, patch
https://github.com/espressif/esp-idf/commit/fba5f995436a3e3139f768b6d8f1a74d5ce1d318	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.