# CVE-2026-113782: ESP-IDF: Stack-Based Out-of-Bounds Write in Thread Border Router ND6 Option Parsing

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- espressif / esp-idf: >= 5.2.0, < 5.2.8 (affected); >= 5.3.0, < 5.3.6 (affected); >= 5.4.0, < 5.4.5 (affected); >= 5.5.0, < 5.5.5 (affected); >= 6.0.0, < 6.0.3 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-121

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/espressif/esp-idf/security/advisories/GHSA-c26h-gm53-qg83 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/espressif/esp-idf/commit/4068c4e7d061b3e2d6096734509feadc14594e28 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/espressif/esp-idf/commit/b6860b2db50406adf0aaebd75f2e9fe64cc805a9 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/espressif/esp-idf/commit/c22480ba07fc1de454a63d42275c764d95c7bd9c (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/espressif/esp-idf/commit/c828d0d709f1c46fa2b9e1ed3ce9d8dc4b29c42f (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/espressif/esp-idf/commit/e18d27e480aec2b282898f4afc22b0f738ea7c04 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/espressif/esp-idf/commit/f9bb1be59081ccef03a1b4b1fab9a225f28b1b61 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-113782; retrieved 2026-11-04; source updated 2026-11-04

Revision: 73d8e9ab92b7a39d67a9d7563f7717908f3af0e9c38a56cf14245aaa3ee3c19f

Canonical: https://y2.dev/cve/CVE-2026-113782

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