{"id":"CVE-2026-26199","aliases":["AZL-92850","DEBIAN-CVE-2026-26199","EUVD-2026-45970","GHSA-5c6x-jmgf-f5vc","JLSEC-2026-1163","UBUNTU-CVE-2026-26199"],"status":"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.","severity":{"version":"4.0","score":5.9,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00351,"percentile":0.29175,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-124"],"published":"2026-07-20T14:59:35Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Azure Linux:3","package":"hdf5","fixed_in":["1.14.6-4"],"sources":["osv"]},{"ecosystem":"Julia","package":"HDF5_jll","fixed_in":["2.1.0+0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.14.6-4"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.10+repack-1","1.10.10+repack-2","1.10.10+repack-3","1.10.10+repack-3.1","1.10.10+repack-3.2","1.10.10+repack-3.2+ports","1.10.10+repack-3.3","1.10.10+repack-4","1.10.10+repack-5","1.10.8+repack1-1","1.12.0+repack-1~exp1","1.12.0+repack-1~exp2","1.12.2+repack-1~exp1","1.14.3+repack-1~exp1","1.14.3+repack1-1~exp2","1.14.3+repack1-1~exp3","1.14.4.3+repack-1~exp1","1.14.4.3+repack-1~exp2","1.14.4.3+repack-1~exp3","1.14.5+repack-1","1.14.5+repack-1~exp1","1.14.5+repack-1~exp2","1.14.5+repack-1~exp3","1.14.5+repack-1~exp4","1.14.5+repack-1~exp5","1.14.5+repack-1~exp6","1.14.5+repack-2","1.14.5+repack-3","1.14.5+repack-3.1","1.14.5+repack-3~exp1","1.14.5+repack-3~exp2","1.14.5+repack-3~exp3","1.14.5+repack-3~exp4","1.14.5+repack-4","1.14.5+repack-4~exp1","1.14.5+repack-4~exp2","1.14.5+repack-5~exp2","1.14.5+repack-5~exp3","1.14.6+repack-1","1.14.6+repack-1~exp1","1.14.6+repack-1~exp10","1.14.6+repack-1~exp11","1.14.6+repack-1~exp12","1.14.6+repack-1~exp13","1.14.6+repack-1~exp14","1.14.6+repack-1~exp15","1.14.6+repack-1~exp16","1.14.6+repack-1~exp17","1.14.6+repack-1~exp18","1.14.6+repack-1~exp19","1.14.6+repack-1~exp2","1.14.6+repack-1~exp20","1.14.6+repack-1~exp21","1.14.6+repack-1~exp3","1.14.6+repack-1~exp4","1.14.6+repack-1~exp5","1.14.6+repack-1~exp6","1.14.6+repack-1~exp7","1.14.6+repack-1~exp8","1.14.6+repack-1~exp9","1.14.6+repack-2","1.14.6+repack-3~exp1","2.1.0+repack-1","2.1.0+repack-1~exp10","2.1.0+repack-1~exp11","2.1.0+repack-1~exp3","2.1.0+repack-1~exp4","2.1.0+repack-1~exp5","2.1.0+repack-1~exp6","2.1.0+repack-1~exp7","2.1.0+repack-1~exp8","2.1.0+repack-1~exp9","2.2.0+repack-1","2.2.0+repack-2","2.2.0+repack-3","2.2.0+repack-4","2.2.0+repack-5"]},{"source":"osv","ecosystem":"Debian:13","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.5+repack-3","1.14.5+repack-3.1","1.14.5+repack-4","1.14.5+repack-4~exp1","1.14.5+repack-4~exp2","1.14.5+repack-5~exp2","1.14.5+repack-5~exp3","1.14.6+repack-1","1.14.6+repack-1~exp1","1.14.6+repack-1~exp10","1.14.6+repack-1~exp11","1.14.6+repack-1~exp12","1.14.6+repack-1~exp13","1.14.6+repack-1~exp14","1.14.6+repack-1~exp15","1.14.6+repack-1~exp16","1.14.6+repack-1~exp17","1.14.6+repack-1~exp18","1.14.6+repack-1~exp19","1.14.6+repack-1~exp2","1.14.6+repack-1~exp20","1.14.6+repack-1~exp21","1.14.6+repack-1~exp3","1.14.6+repack-1~exp4","1.14.6+repack-1~exp5","1.14.6+repack-1~exp6","1.14.6+repack-1~exp7","1.14.6+repack-1~exp8","1.14.6+repack-1~exp9","1.14.6+repack-2","1.14.6+repack-3~exp1","2.1.0+repack-1","2.1.0+repack-1~exp10","2.1.0+repack-1~exp11","2.1.0+repack-1~exp3","2.1.0+repack-1~exp4","2.1.0+repack-1~exp5","2.1.0+repack-1~exp6","2.1.0+repack-1~exp7","2.1.0+repack-1~exp8","2.1.0+repack-1~exp9","2.2.0+repack-1","2.2.0+repack-2","2.2.0+repack-3","2.2.0+repack-4","2.2.0+repack-5"]},{"source":"osv","ecosystem":"Debian:14","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.5+repack-3","1.14.5+repack-3.1","1.14.5+repack-4","1.14.5+repack-4~exp1","1.14.5+repack-4~exp2","1.14.5+repack-5~exp2","1.14.5+repack-5~exp3","1.14.6+repack-1","1.14.6+repack-1~exp1","1.14.6+repack-1~exp10","1.14.6+repack-1~exp11","1.14.6+repack-1~exp12","1.14.6+repack-1~exp13","1.14.6+repack-1~exp14","1.14.6+repack-1~exp15","1.14.6+repack-1~exp16","1.14.6+repack-1~exp17","1.14.6+repack-1~exp18","1.14.6+repack-1~exp19","1.14.6+repack-1~exp2","1.14.6+repack-1~exp20","1.14.6+repack-1~exp21","1.14.6+repack-1~exp3","1.14.6+repack-1~exp4","1.14.6+repack-1~exp5","1.14.6+repack-1~exp6","1.14.6+repack-1~exp7","1.14.6+repack-1~exp8","1.14.6+repack-1~exp9","1.14.6+repack-2","1.14.6+repack-3~exp1","2.1.0+repack-1","2.1.0+repack-1~exp10","2.1.0+repack-1~exp11","2.1.0+repack-1~exp3","2.1.0+repack-1~exp4","2.1.0+repack-1~exp5","2.1.0+repack-1~exp6","2.1.0+repack-1~exp7","2.1.0+repack-1~exp8","2.1.0+repack-1~exp9","2.2.0+repack-1","2.2.0+repack-2","2.2.0+repack-3","2.2.0+repack-4","2.2.0+repack-5"]},{"source":"osv","ecosystem":"Julia","package":"HDF5_jll","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.0+0"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.11-3ubuntu1","1.8.11-5ubuntu1","1.8.11-5ubuntu2","1.8.11-5ubuntu6","1.8.11-5ubuntu7","1.8.11-5ubuntu7.1","1.8.11-5ubuntu7.1+esm1","1.8.11-5ubuntu7.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.15-patch1+docs-4","1.8.15-patch1+docs-5","1.8.16+docs-1","1.8.16+docs-2","1.8.16+docs-3","1.8.16+docs-3ubuntu1","1.8.16+docs-4","1.8.16+docs-4ubuntu1","1.8.16+docs-4ubuntu1.1","1.8.16+docs-4ubuntu1.1+esm1","1.8.16+docs-4ubuntu1.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-patch1+docs-4","1.10.0-patch1+docs-4ubuntu0.1~esm1","1.10.0-patch1+docs-4ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.4+repack-10","1.10.4+repack-11","1.10.4+repack-11ubuntu1","1.10.4+repack-11ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.6+repack-5","1.10.7+repack-4ubuntu1","1.10.7+repack-4ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.8+repack1-1ubuntu1","1.10.10+repack-3ubuntu1","1.10.10+repack-3.1ubuntu3","1.10.10+repack-3.1ubuntu4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.6+repack-2","2.2.0+repack-4","2.2.0+repack-5"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"hdf5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.5+repack-3build1","1.14.5+repack-4","1.14.6+repack-2"]}],"products":[{"vendor":"hdfgroup","product":"hdf5"}],"references":[{"url":"https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc","tags":["x_refsource_CONFIRM","exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474","tags":["x_refsource_MISC","Exploit","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26199","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26199.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-26199","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-26199","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-26199","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-26199","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.","status":"published","published":"2026-07-20T14:59:35.038Z","modified":"2026-07-20T18:56:52.113Z","cvss":[{"version":"4.0","score":5.9,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-124"],"updated_at":"2026-11-02T13:38:20.971157Z"}],"euvd":[{"id":"EUVD-2026-45970","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.","status":"published","published":"2026-07-20T14:59:35Z","modified":"2026-07-20T18:56:52Z","cvss":[{"version":"4.0","score":5.9,"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","level":"medium"}],"updated_at":"2026-11-02T18:19:48.530346Z"}],"nvd":[{"id":"CVE-2026-26199","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.","status":"published","published":"2026-07-20T16:16:57.55Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"4.0","score":5.9,"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/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-124"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"CVE-2026-26199","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.","status":"published","published":"2026-07-20T14:59:35.038Z","modified":"2026-10-29T02:48:32.077481839Z","cvss":[{"version":"4.0","score":5.9,"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","level":"medium"}],"cwes":["CWE-124"],"updated_at":"2026-11-02T15:44:59.80315Z"},{"id":"DEBIAN-CVE-2026-26199","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.","status":"published","published":"2026-07-20T16:16:57.55Z","modified":"2026-10-25T09:47:29.702117968Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:53.877573Z"},{"id":"JLSEC-2026-1163","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.","status":"published","published":"2026-08-04T13:25:24.347Z","modified":"2026-08-04T13:30:03.7192775Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"},{"version":"4.0","score":5.9,"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/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","level":"medium"}],"updated_at":"2026-11-02T15:47:18.159338Z"},{"id":"UBUNTU-CVE-2026-26199","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.","status":"published","published":"2026-07-20T16:16:00Z","modified":"2026-10-17T12:56:18.139805842Z","cvss":[{"version":"4.0","score":5.9,"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","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T16:56:08.726452Z"},{"id":"AZL-92850","title":"CVE-2026-26199 affecting package hdf5 for versions less than 1.14.6-4","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.","status":"published","published":"2026-07-20T16:16:57Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.880689Z"}]}}