CVE-2026-100403

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-100403", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-25T20:08:33.083Z", "datePublished": "2026-11-13T18:41:06.709Z", "dateUpdated": "2026-11-13T18:41:06.709Z"}, "containers": {"cna": {"title": "BACnet Stack: BACnet/SC hub grows its WebSocket reassembly buffer without limit, so a peer can exhaust its memory", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-4vgv-v5ph-rmxr", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-4vgv-v5ph-rmxr"}, {"name": "https://github.com/bacnet-stack/bacnet-stack/pull/1433", "tags": ["x_refsource_MISC"], "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1433"}], "affected": [{"vendor": "bacnet-stack", "product": "bacnet-stack", "versions": [{"version": "< 1.4.6", "status": "affected"}, {"version": ">= 1.5.0, < 1.5.2", "status": "affected"}, {"version": ">= 1.6.0, < 1.6.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-13T18:41:06.709Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-4vgv-v5ph-rmxr", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "bacnet-stack", "vendor": "bacnet-stack", "versions": [{"status": "affected", "version": "< 1.4.6"}, {"status": "affected", "version": ">= 1.5.0, < 1.5.2"}, {"status": "affected", "version": ">= 1.6.0, < 1.6.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-100403", "lastModified": "2026-11-13T19:17:36.427", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T19:17:36.427", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1433"}, {"source": "security-advisories@github.com", "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-4vgv-v5ph-rmxr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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