Skip to content
Heist/ feed
High

Stack out-of-bounds write in the OSDP Control Panel reply parser

Type: advisorySource: Official CVE List1 source record

The OSDP Control Panel reply parser cp_decode_response() in subsys/mgmt/osdp/src/osdp_cp.c decodes replies from a Peripheral Device into a stack-allocated struct osdp_event. For the REPLY_KEYPPAD and REPLY_RAW reply types, the payload length is taken from the received frame and the only validation performed is that the declared length is self-consistent with the number of payload bytes present in the frame. Because the attacker controls both the length field and the frame length, that check imposes no bound, and the subsequent memcpy() writes into the fixed 64-byte data arrays of struct osdp_event_keypress / struct osdp_event_cardread (OSDP_EVENT_MAX_DATALEN). The sibling REPLY_FMT handler in the same switch already carried the missing > OSDP_EVENT_MAX_DATALEN bound. The defect is reached from cp_process_reply(), which reads bytes from the OSDP RS-485 channel and passes them through osdp_phy_check_packet() and osdp_phy_decode_packet() before dispatching on the reply ID. Triggering it requires CONFIG_OSDP with CONFIG_OSDP_MODE_CP and an application event callback registered (the normal Control Panel integration), plus a frame carrying a correct SOM, a valid CRC-16, and a matching 2-bit sequence number — all of which are computable or observable by anyone on the bus. No check ties the reply ID to the outstanding command, so an oversized REPLY_KEYPPAD or REPLY_RAW is accepted as the answer to a routine CMD_POLL. A malicious or compromised card reader, or anyone with access to th

Announced Group revision 1
Original source ↗

CVE-2026-76788

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-76788

zephyr

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "zephyrproject",
    "product": "zephyr",
    "versions": [
      {
        "status": "affected",
        "version": "3.3.0",
        "versionType": "semver",
        "lessThanOrEqual": "4.4.2"
      }
    ],
    "packageName": "zephyr",
    "programFiles": [
      "subsys/mgmt/osdp/src/osdp_cp.c"
    ],
    "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
    "defaultStatus": "unaffected",
    "programRoutines": [
      {
        "name": "cp_decode_response"
      }
    ]
  }
]
Related CVEs
CVE-2026-76788

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#42482 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement