{"id":"CVE-2026-26199","state":"PUBLISHED","title":"Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero","description":"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.","publishedAt":"2026-07-20T14:59:35.038Z","updatedAt":"2026-07-20T18:56:52.113Z","severity":{"score":5.9,"label":"Medium","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["HDFGroup hdf5"],"affected":[{"vendor":"HDFGroup","product":"hdf5","versions":[{"version":"<= 1.14.6","status":"affected"}]}],"references":["https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc","https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474"],"weaknesses":["CWE-124"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/26xxx/CVE-2026-26199.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-26199","state":"PUBLISHED","datePublished":"2026-07-20T14:59:35.038Z","dateUpdated":"2026-07-20T18:56:52.113Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-11T19:56:24.813Z"},"containers":{"cna":{"title":"Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero","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."}],"affected":[{"vendor":"HDFGroup","product":"hdf5","versions":[{"version":"<= 1.14.6","status":"affected"}]}],"references":[{"url":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc","name":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474","name":"https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-124","lang":"en","description":"CWE-124: Buffer Underwrite ('Buffer Underflow')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-20T14:59:35.038Z"},"source":{"advisory":"GHSA-5c6x-jmgf-f5vc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T18:56:40.908924Z","id":"CVE-2026-26199","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T18:56:52.113Z"}}]}}}