---
title: "CVE-2026-81038: Zephyr OTS - Information Disclosure & Denial of Service"
description: "Zephyr OTS server contains an uninitialized memory disclosure and denial of service caused by improper handling of OACP checksum response in oacp_ind_send(), letting nearby attackers disclose stack memory or crash the device, exploit requires no authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-81038/
---

# CVE-2026-81038 Zephyr OTS - Information Disclosure & Denial of Service

Zephyr OTS server contains an uninitialized memory disclosure and denial of service caused by improper handling of OACP checksum response in oacp\_ind\_send(), letting nearby attackers disclose stack memory or crash the device, exploit requires no authentication.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-81038)

## Details

Type

Information Disclosure

Impact

Information Disclosure, Denial Of Service

CVSS vector

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

Published

26 October 2026

Updated

27 October 2026

Weakness

[CWE-617](https://cwe.mitre.org/data/definitions/617.html)

## Vendor fix

Update to the latest Zephyr version with the fix for OACP checksum response handling.

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-2026-81038](https://nvd.nist.gov/vuln/detail/CVE-2026-81038)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7c9w-mhqw-5g86](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7c9w-mhqw-5g86)
- [https://github.com/zephyrproject-rtos/zephyr/commit/36145a6f1164e2e0a18c8c83d5b1be6e7d3f6e23](https://github.com/zephyrproject-rtos/zephyr/commit/36145a6f1164e2e0a18c8c83d5b1be6e7d3f6e23)

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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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