# Hdfgroup HDF5 vulnerabilities Source: https://junglewise.ai/threats/technologies/hdf5 Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/hdf5.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 13 vulnerabilities in Hdfgroup HDF5: 0 in the last 7 days and 5 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-120758, was published on 3 November 2026. 4 vulnerabilities in the last four weeks, up 300% on the four before (1). ## Counts - Last 7 days: 0 - Last 30 days: 4 - Last 90 days: 5 - All time: 13 (0 critical, 0 exploited in the wild) ## About Hdfgroup HDF5 C library and data format for managing large amounts of numerical scientific data. ## Latest Hdfgroup HDF5 vulnerabilities - [CVE-2026-120758: HDF5 NULL pointer dereference in H5HL_unprotect](https://junglewise.ai/threats/cve-2026-120758-hdf5-through-2-2-0-contains-a-null-pointer-dereference) (info, published 3 Nov 2026) - [CVE-2026-120756: HDF5 heap buffer over-read in object header deserialization](https://junglewise.ai/threats/cve-2026-120756-hdf5-through-2-2-0-contains-a-heap-buffer-over-read) (info, published 3 Nov 2026) - [CVE-2026-120755: HDF5 out-of-bounds read in szip filter](https://junglewise.ai/threats/cve-2026-120755-hdf5-through-2-2-0-contains-an-out-of-bounds-read-vulnerability) (info, published 3 Nov 2026) - [CVE-2026-120689: HDF5 uncontrolled recursion in B-tree iteration](https://junglewise.ai/threats/cve-2026-120689-hdf5-through-2-2-0-contains-an-uncontrolled-recursion) (info, published 2 Nov 2026) - [CVE-2026-92627: HDF5 heap-use-after-free in floating-point datatype conversion](https://junglewise.ai/threats/cve-2026-92627-hdf5-heap-use-after-free-in-floating-point-datatype-conversion) (info, CVSS 7.5, published 16 Sep 2026) - [CVE-2026-17574: The HDF Group HDF5 NULL pointer dereference in H5O__dtype_decode_helper](https://junglewise.ai/threats/cve-2026-17574-the-hdf-group-hdf5-null-pointer-dereference-in-h5o-dtype-decode) (info, CVSS 5.2, published 27 Jul 2026) - [CVE-2026-17573: The HDF Group HDF5 double free in h5repack](https://junglewise.ai/threats/cve-2026-17573-the-hdf-group-hdf5-double-free-in-h5repack) (info, CVSS 6.7, published 27 Jul 2026) - [CVE-2026-17572: The HDF Group HDF5 heap buffer overflow in SOHM list-index deserialization](https://junglewise.ai/threats/cve-2026-17572-the-hdf-group-hdf5-heap-buffer-overflow-in-sohm-list-index) (info, CVSS 5.5, published 27 Jul 2026) - [CVE-2026-26199: HDFGroup HDF5 buffer underflow in H5Iget_name](https://junglewise.ai/threats/cve-2026-26199-hdfgroup-hdf5-buffer-underflow-in-h5iget-name) (info, CVSS 5.9, published 20 Jul 2026) - [CVE-2026-26197: HDFGroup HDF5 out-of-bounds read in H5Odtype.c](https://junglewise.ai/threats/cve-2026-26197-hdfgroup-hdf5-out-of-bounds-read-in-h5odtype-c) (info, CVSS 5.9, published 20 Jul 2026) - [CVE-2026-29043: HDFGroup HDF5 heap buffer overflow in H5T__ref_mem_setnull](https://junglewise.ai/threats/cve-2026-29043-hdfgroup-hdf5-heap-buffer-overflow-in-h5t-ref-mem-setnull) (medium, CVSS 5.5, published 10 Apr 2026) - [CVE-2026-34734: HDFGroup HDF5 heap use-after-free in h5dump utility](https://junglewise.ai/threats/cve-2026-34734-hdfgroup-hdf5-heap-use-after-free-in-h5dump-utility) (high, CVSS 7.8, published 9 Apr 2026) - [CVE-2026-26200: HDFGroup HDF5 heap buffer overflow in H5T__conv_struct_opt](https://junglewise.ai/threats/cve-2026-26200-hdfgroup-hdf5-heap-buffer-overflow-in-h5t-conv-struct-opt) (high, CVSS 7.8, published 19 Feb 2026) ## Most severe Hdfgroup HDF5 vulnerabilities - [CVE-2026-26200: HDFGroup HDF5 heap buffer overflow in H5T__conv_struct_opt](https://junglewise.ai/threats/cve-2026-26200-hdfgroup-hdf5-heap-buffer-overflow-in-h5t-conv-struct-opt) (high, CVSS 7.8, published 19 Feb 2026) - [CVE-2026-34734: HDFGroup HDF5 heap use-after-free in h5dump utility](https://junglewise.ai/threats/cve-2026-34734-hdfgroup-hdf5-heap-use-after-free-in-h5dump-utility) (high, CVSS 7.8, published 9 Apr 2026) - [CVE-2026-29043: HDFGroup HDF5 heap buffer overflow in H5T__ref_mem_setnull](https://junglewise.ai/threats/cve-2026-29043-hdfgroup-hdf5-heap-buffer-overflow-in-h5t-ref-mem-setnull) (medium, CVSS 5.5, published 10 Apr 2026) - [CVE-2026-92627: HDF5 heap-use-after-free in floating-point datatype conversion](https://junglewise.ai/threats/cve-2026-92627-hdf5-heap-use-after-free-in-floating-point-datatype-conversion) (info, CVSS 7.5, published 16 Sep 2026) - [CVE-2026-17573: The HDF Group HDF5 double free in h5repack](https://junglewise.ai/threats/cve-2026-17573-the-hdf-group-hdf5-double-free-in-h5repack) (info, CVSS 6.7, published 27 Jul 2026) - [CVE-2026-26199: HDFGroup HDF5 buffer underflow in H5Iget_name](https://junglewise.ai/threats/cve-2026-26199-hdfgroup-hdf5-buffer-underflow-in-h5iget-name) (info, CVSS 5.9, published 20 Jul 2026) - [CVE-2026-26197: HDFGroup HDF5 out-of-bounds read in H5Odtype.c](https://junglewise.ai/threats/cve-2026-26197-hdfgroup-hdf5-out-of-bounds-read-in-h5odtype-c) (info, CVSS 5.9, published 20 Jul 2026) - [CVE-2026-17572: The HDF Group HDF5 heap buffer overflow in SOHM list-index deserialization](https://junglewise.ai/threats/cve-2026-17572-the-hdf-group-hdf5-heap-buffer-overflow-in-sohm-list-index) (info, CVSS 5.5, published 27 Jul 2026) - [CVE-2026-17574: The HDF Group HDF5 NULL pointer dereference in H5O__dtype_decode_helper](https://junglewise.ai/threats/cve-2026-17574-the-hdf-group-hdf5-null-pointer-dereference-in-h5o-dtype-decode) (info, CVSS 5.2, published 27 Jul 2026) - [CVE-2026-120758: HDF5 NULL pointer dereference in H5HL_unprotect](https://junglewise.ai/threats/cve-2026-120758-hdf5-through-2-2-0-contains-a-null-pointer-dereference) (info, published 3 Nov 2026) ## Vulnerabilities per week 4 vulnerabilities in the last four weeks, up 300% on the four before (1). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 1 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 4 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Hdfgroup HDF5 vulnerabilities", https://junglewise.ai/threats/technologies/hdf5, 11 November 2026.