Espressif ESP-IDF up to 6.0.2 Neighbor Discovery Packet out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in Espressif ESP-IDF up to 5.2.7/5.3.5/5.4.4/5.5.4/6.0.2. Affected is an unknown function of the component Neighbor Discovery Packet Handler. The manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2026-113782. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Espressif ESP-IDF up to 5.2.7/5.3.5/5.4.4/5.5.4/6.0.2. Affected is an unknown functionality of the component Neighbor Discovery Packet Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on integrity, and availability. CVE summarizes:

ESP-IDF is the Espressif Internet of Things (IOT) Development Framework. From 5.2.0 until 5.2.8, 5.3.6, 5.4.5, 5.5.5, and 6.0.3, the OpenThread Border Router Neighbor Discovery packet handler trusts an attacker-controlled ICMPv6 option length while copying into a fixed stack buffer. A host on the same infrastructure link as the Border Router can send a crafted ICMPv6 Router Advertisement to its infrastructure interface whose oversized length causes an out-of-bounds write into adjacent stack memory. Firmware is affected only when CONFIG_OPENTHREAD_BORDER_ROUTER=y; Thread end devices, routers, and RCP firmware without the Border Router feature are unaffected. Exploitation requires no authentication or user interaction and can crash or reboot the device or corrupt adjacent stack state. This issue is fixed in versions 5.2.8, 5.3.6, 5.5.5, and 6.0.3 and is scheduled to be fixed in version 5.4.5.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-113782 since 10/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

Upgrading to version 5.2.8, 5.3.6, 5.4.5, 5.5.5 or 6.0.3 eliminates this vulnerability.

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Productinfo

Vendor

• Espressif

Name

• ESP-IDF

Version

• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.7
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.4.0
• 5.4.1
• 5.4.2
• 5.4.3
• 5.4.4
• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3
• 5.5.4
• 6.0.0
• 6.0.1
• 6.0.2

Website

• Product: https://github.com/espressif/esp-idf/

CPE 2.3info

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CPE 2.2info

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