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 ↗

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

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

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