CVE-2026-19027

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-19027", "assignerOrgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "state": "PUBLISHED", "assignerShortName": "HDFG", "dateReserved": "2026-08-05T22:14:41.114Z", "datePublished": "2026-08-05T23:12:20.658Z", "dateUpdated": "2026-10-06T20:33:19.385Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "shortName": "HDFG", "dateUpdated": "2026-10-06T20:33:19.385Z"}, "title": "HDF5 out-of-bounds heap read in N-Bit filter decompression", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds read", "type": "CWE"}]}], "affected": [{"vendor": "The HDF Group", "product": "HDF5", "versions": [{"status": "affected", "version": "<=2.3.0"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.<br><br><br>"}]}], "references": [{"url": "https://github.com/HDFGroup/hdf5/pull/6497"}, {"url": "https://github.com/HDFGroup/hdf5/issues/6489"}, {"url": "https://github.com/HDFGroup/hdf5/issues/6492"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.4"}}, "adp": [{"references": [{"url": "https://github.com/HDFGroup/hdf5/issues/6489", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-06T14:29:51.698432Z", "id": "CVE-2026-19027", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-06T14:30:48.955Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-19027", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-06T14:29:51.698432Z"}}}], "references": [{"url": "https://github.com/HDFGroup/hdf5/issues/6489", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-06T14:30:18.668Z"}}], "cna": {"title": "HDF5 out-of-bounds heap read in N-Bit filter decompression", "source": {"discovery": "UNKNOWN"}, "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "The HDF Group", "product": "HDF5", "versions": [{"status": "affected", "version": "<=2.3.0"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://github.com/HDFGroup/hdf5/pull/6497"}, {"url": "https://github.com/HDFGroup/hdf5/issues/6489"}, {"url": "https://github.com/HDFGroup/hdf5/issues/6492"}], "x_generator": {"engine": "Vulnogram 1.0.4"}, "descriptions": [{"lang": "en", "value": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.", "supportingMedia": [{"type": "text/html", "value": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.<br><br><br>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds read"}]}], "providerMetadata": {"orgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "shortName": "HDFG", "dateUpdated": "2026-10-06T20:33:19.385Z"}}}, "cveMetadata": {"cveId": "CVE-2026-19027", "state": "PUBLISHED", "dateUpdated": "2026-10-06T20:33:19.385Z", "dateReserved": "2026-08-05T22:14:41.114Z", "assignerOrgId": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "datePublished": "2026-08-05T23:12:20.658Z", "assignerShortName": "HDFG"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "HDF5", "vendor": "The HDF Group", "versions": [{"status": "affected", "version": "<=2.3.0"}]}], "source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5\nprior to 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools."}, {"lang": "es", "value": "Las funciones H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype y H5Z__nbit_decompress_one_atomic en H5Znbit.c de HDF5, en versiones anteriores a 2.3.0, avanzan un \u00edndice de lectura en el b\u00fafer de fragmentos comprimidos sin limitarlo al tama\u00f1o real del b\u00fafer. Esto permite a los atacantes provocar una lectura de pila fuera de l\u00edmites (out-of-bounds heap read) y, en casos restringidos, la divulgaci\u00f3n de memoria de pila adyacente en valores de conjuntos de datos descomprimidos, a trav\u00e9s de un archivo HDF5 manipulado cuyos par\u00e1metros de filtro N-Bit describen m\u00e1s datos descomprimidos de los que el fragmento comprimido almacenado contiene realmente, lo que se activa a trav\u00e9s de H5Dread, por ejemplo, mediante las herramientas h5ls o h5repack."}], "id": "CVE-2026-19027", "lastModified": "2026-10-23T21:10:00.157", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-19027", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-06T14:29:51.698432Z", "version": "2.0.3"}}]}, "published": "2026-08-06T00:16:53.253", "references": [{"source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "url": "https://github.com/HDFGroup/hdf5/issues/6489"}, {"source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "url": "https://github.com/HDFGroup/hdf5/issues/6492"}, {"source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "url": "https://github.com/HDFGroup/hdf5/pull/6497"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/HDFGroup/hdf5/issues/6489"}], "sourceIdentifier": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "0253b833-3e77-4dfe-9d57-17db1a2f0a74", "type": "Secondary"}]}

{"bugzilla": {"description": "hdf5: HDF5: Information disclosure and denial of service via crafted HDF5 file", "id": "2511860", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511860"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["The H5Z__nbit_decompress_one_byte, H5Z__nbit_decompress_one_nooptype, and H5Z__nbit_decompress_one_atomic functions in H5Znbit.c in HDF5 through 2.3.0 advance a read index into the compressed chunk buffer without bounding it against the buffer's actual size. This allows attackers to cause an out-of-bounds heap read, and in constrained cases disclosure of adjacent heap memory into decompressed dataset values, via a crafted HDF5 file whose N-Bit filter parameters describe more decompressed data than the stored compressed chunk actually contains, triggered via H5Dread, e.g. by the h5ls or h5repack tools.", "A flaw was found in HDF5, a widely used data management library. This vulnerability allows an attacker to craft a malicious HDF5 file that, when processed, can cause the application to read beyond its allocated memory. This out-of-bounds read could lead to the disclosure of sensitive information or result in a denial of service (DoS), making the application unavailable."], "mitigation": {"lang": "en:us", "value": "Do not open or process untrusted HDF5 files from unverified sources using tools or services linked against the HDF5 library. Enforce strict file-ingestion boundaries or access controls to prevent automated parsing of untrusted datasets."}, "name": "CVE-2026-19027", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Under investigation", "package_name": "hdf5", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Under investigation", "package_name": "hdf5", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-05T23:12:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19027\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19027\nhttps://github.com/HDFGroup/hdf5/issues/6489\nhttps://github.com/HDFGroup/hdf5/issues/6492\nhttps://github.com/HDFGroup/hdf5/pull/6497"], "statement": "A boundary validation flaw exists in the N-Bit decompression routines (H5Z__nbit_decompress_one_*) within the HDF5 library. When processing datasets via H5Dread(), the functions fail to bound the read index against the compressed buffer size. An attacker can exploit this by enticing a user or automated service to open a crafted HDF5 file with mismatched N-Bit filter parameters, causing a heap out-of-bounds read. This flaw primarily impacts system availability via application crashes, with a secondary risk of minor heap memory disclosure.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.3.0]"}}], "enrichment": {"confidence": 84.0, "confidence_source": "matching", "scores": [{"score": 84.0, "source": "matching"}]}, "original": {"product": "HDF5", "source": "cna", "vendor": "The HDF Group"}, "product": "hdf5", "vendor": "hdfgroup"}], "created": "2026-08-06T00:30:03.927061+00:00", "updated": "2026-10-07T08:45:14.941179+00:00", "vendors": ["hdfgroup", "hdfgroup$PRODUCT$hdf5"]}