---
title: "CVE-2026-19186: Zephyr IEEE802154 - Out-of-Bounds Read & Write"
description: "Zephyr subsys/net/l2/ieee802154 contains an out-of-bounds read and write caused by improper length validation in ieee802154_decipher_data_frame(), letting remote attackers cause memory corruption and denial of service by sending crafted short frames, exploit requires enabled CONFIG_NET_L2_IEEE802154_SECURITY with crypto device and active security session."
url: https://panop.io/threat-heartbeat/CVE-2026-19186/
---

# CVE-2026-19186 Zephyr IEEE802154 - Out-of-Bounds Read & Write

Zephyr subsys/net/l2/ieee802154 contains an out-of-bounds read and write caused by improper length validation in ieee802154\_decipher\_data\_frame(), letting remote attackers cause memory corruption and denial of service by sending crafted short frames, exploit requires enabled CONFIG\_NET\_L2\_IEEE802154\_SECURITY with crypto device and active security session.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19186)

## Details

Type

Out-of-Bounds Read

Impact

Denial Of Service, Data Tampering

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Published

7 October 2026

Updated

15 October 2026

Weakness

[CWE-191](https://cwe.mitre.org/data/definitions/191.html)

## Vendor fix

Update to a version that rejects frames shorter than ll\_hdr\_len + authtag\_len and adds transmit side guards, or upgrade to the latest Zephyr version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-19186](https://nvd.nist.gov/vuln/detail/CVE-2026-19186)
- [https://github.com/zephyrproject-rtos/zephyr/commit/6d721de13a6026808f75578ecfee95a3592d5264](https://github.com/zephyrproject-rtos/zephyr/commit/6d721de13a6026808f75578ecfee95a3592d5264)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6x64-rwq6-j8x3](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6x64-rwq6-j8x3)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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