CVE-2026-100403

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Source

https://cve.org/CVERecord?id=CVE-2026-100403

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100403.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-100403

Aliases

GHSA-4vgv-v5ph-rmxr

Published

2026-11-13T18:41:06Z

Modified

2026-11-14T10:45:21Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

BACnet Stack: BACnet/SC hub grows its WebSocket reassembly buffer without limit, so a peer can exhaust its memory

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.6, 1.5.2, and 1.6.1, the BACnet/SC hub's Linux WebSocket server reassembles fragmented WebSocket messages into a per-connection fragment_buffer. It grows that buffer with realloc() on every non-final frame, with no upper bound. A peer that streams binary continuation fragments and never sets FIN keeps the hub reallocating until the box runs out of memory or the process is OOM-killed. The buffer starts at the maximum legal BVLC-SC NPDU size, but nothing after that ties its growth back to that limit. This issue has been patched in versions 1.4.6, 1.5.2, 1.6.1, and 1.7.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100403.json"
}

References

Affected packages

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

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Fixed

92e503566c990269f85ee15370d88415ad7ff6fb

Introduced

61a7a53bea5b5bc4724646abbce601fd26c364b6

Fixed

d2468d56de3d156659a9051c95119e3a6e11c421

Introduced

9bc3cfa07aab98852de432fa24079f4b4b6b7eed

Fixed

7a53f0a72a92de1621d30fc63703a29afe12bfaf

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.4.6"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "1.5.0"
                },
                {
                    "fixed": "1.5.2"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "1.6.0"
                },
                {
                    "fixed": "1.6.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        }
    ]
}

Affected versions

bacnet-stack-1.*

bacnet-stack-1.0.0

bacnet-stack-1.1.1

bacnet-stack-1.2.0

bacnet-stack-1.3.0

bacnet-stack-1.3.1

bacnet-stack-1.3.2

bacnet-stack-1.3.3

bacnet-stack-1.3.4

bacnet-stack-1.3.5

bacnet-stack-1.3.6

bacnet-stack-1.3.7

bacnet-stack-1.3.8

bacnet-stack-1.4.0

bacnet-stack-1.4.3

bacnet-stack-1.4.4

bacnet-stack-1.4.5

bacnet-stack-1.5.0

bacnet-stack-1.5.1

bacnet-stack-1.6.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100403.json"