CVE-2026-49990

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-49990", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-02T18:30:51.282Z", "datePublished": "2026-11-13T15:54:22.681Z", "dateUpdated": "2026-11-13T15:54:22.681Z"}, "containers": {"cna": {"title": "BACnet Stack: AtomicReadFile/AtomicWriteFile stream fileStartPosition validation flaw causes out-of-bounds read/write in RAM file backends", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-787", "lang": "en", "description": "CWE-787: Out-of-bounds Write", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8759-hx7g-94qx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8759-hx7g-94qx"}, {"name": "https://github.com/bacnet-stack/bacnet-stack/pull/1362", "tags": ["x_refsource_MISC"], "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1362"}], "affected": [{"vendor": "bacnet-stack", "product": "bacnet-stack", "versions": [{"version": ">= 1.4.2, < 1.4.5", "status": "affected"}, {"version": ">= 1.5.0, < 1.5.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-13T15:54:22.681Z"}, "descriptions": [{"lang": "en", "value": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.2 to before 1.4.5, and 1.5.0 to before 1.5.1, a signed fileStartPosition taken from AtomicReadFile and AtomicWriteFile stream-access requests is not validated tightly enough before it reaches the RAM file backends. Practical impact includes: reliable denial of service via process crash, out-of-bounds read that may expose adjacent memory contents, or out-of-bounds write that may corrupt heap memory and destabilize the process. This issue has been patched in versions 1.4.5 and 1.5.1."}], "source": {"advisory": "GHSA-8759-hx7g-94qx", "discovery": "UNKNOWN"}}}}

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{"affected": [{"affectedData": [{"product": "bacnet-stack", "vendor": "bacnet-stack", "versions": [{"status": "affected", "version": ">= 1.4.2, < 1.4.5"}, {"status": "affected", "version": ">= 1.5.0, < 1.5.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.2 to before 1.4.5, and 1.5.0 to before 1.5.1, a signed fileStartPosition taken from AtomicReadFile and AtomicWriteFile stream-access requests is not validated tightly enough before it reaches the RAM file backends. Practical impact includes: reliable denial of service via process crash, out-of-bounds read that may expose adjacent memory contents, or out-of-bounds write that may corrupt heap memory and destabilize the process. This issue has been patched in versions 1.4.5 and 1.5.1."}], "id": "CVE-2026-49990", "lastModified": "2026-11-13T16:19:01.983", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-13T16:19:01.983", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1362"}, {"source": "security-advisories@github.com", "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8759-hx7g-94qx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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