CVE-2026-41503

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Source

https://cve.org/CVERecord?id=CVE-2026-41503

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41503.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-41503

Aliases

GHSA-5w2v-mwqj-pr2c

Published

2026-04-24T19:41:44.071Z

Modified

2026-07-15T01:48:53.134667738Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpmdecodeobjectproperty() calling the deprecated decodetagnumberand_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Database specific

{
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41503.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/bacnet-stack/bacnet-stack

Affected ranges

Type

GIT

Repo

https://github.com/bacnet-stack/bacnet-stack

Events

Introduced

f332225b196aa66503faae64f92bef113fe89ab2

Fixed

6d2d251ca4f4d932664add702b236279863d630a

Database specific

{
    "cpe": "cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "1.4.0"
        },
        {
            "fixed": "1.4.3"
        }
    ]
}

Affected versions

bacnet-stack-1.*

bacnet-stack-1.4.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41503.json"