CVE-2026-76788 Zephyr OSDP Control Panel - Buffer Overflow

Zephyr OSDP Control Panel (cp_decode_response) contains a stack buffer overflow caused by missing bounds check on payload length in REPLY_KEYPPAD and REPLY_RAW reply types, letting attackers with access to RS-485 bus potentially hijack control flow, exploit requires access to OSDP RS-485 channel and ability to send crafted frames.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
19 October 2026
Updated
20 October 2026
Weakness
CWE-787

Vendor fix

Apply the patch that adds OSDP_EVENT_MAX_DATALEN bounds checks to handlers or update to the latest Zephyr version with this fix.

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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