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CVE-2026-45160 espressif CVE debrief

CVE-2026-45160 is an out-of-bounds read flaw 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.

Vendor
espressif
Product
esp-idf
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Users of Espressif ESP-IDF versions 5.2.7, 5.3.5, 5.4.4, 5.5.4, and 6.0.1 who use the DHCP server feature, especially in SoftAP configurations or where the device acts as a DHCP server on a local network.

Technical summary

The vulnerability exists in the DHCP server option parser. It allows an attacker to send a crafted DHCP request that can cause the parser to read past the end of the options buffer into adjacent heap memory, potentially leading to information disclosure.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to a patched version of ESP-IDF: 5.2.8, 5.3.6, 5.4.5, 5.5.5, or 6.0.2, or later.
  • Avoid using affected versions of ESP-IDF in configurations where the device runs as a DHCP server on a local network.

Evidence notes

The CVE-2026-45160 issue has been patched in versions 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.2 of ESP-IDF.

Official resources

CVE-2026-45160 was published on 2026-06-10T02:16:32.520Z and modified on 2026-06-11T18:22:05.747Z.