CVE-2026-26199

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.

CVSS

No CVSS.

References

Link	Resource
https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474
https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc
https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc

Configurations

No configuration.

History

20 Jul 2026, 19:17

Type	Values Removed	Values Added
References	~~() https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc -~~	() https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc -

20 Jul 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-20 16:16

Updated : 2026-07-20 19:17

NVD link : CVE-2026-26199

Mitre link : CVE-2026-26199

CVE.ORG link : CVE-2026-26199

JSON object : View

Products Affected

No product.

CWE

CWE-124

Buffer Underwrite ('Buffer Underflow')

{"id": "CVE-2026-26199", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26199", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-20T18:56:40.908924Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "HDFGroup", "product": "hdf5", "versions": [{"status": "affected", "version": "<= 1.14.6"}]}]}], "published": "2026-07-20T16:16:57.550", "references": [{"url": "https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474", "source": "security-advisories@github.com"}, {"url": "https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc", "source": "security-advisories@github.com"}, {"url": "https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-124"}]}], "descriptions": [{"lang": "en", "value": "HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer."}], "lastModified": "2026-07-20T19:17:20.487", "sourceIdentifier": "security-advisories@github.com"}