CVE-2026-34734 | HDFGroup HDF5 up to 1.14.1-2 Memmove Call H5T__conv_struct use after free

VDB-356665 · CVE-2026-34734 · GCVE-0-2026-34734 HDFGROUP HDF5 UP TO 1.14.1-2 MEMMOVE CALL H5T__CONV_STRUCT USE AFTER FREE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.5 $0-$5k 0.84 Summaryinfo A vulnerability, which was classified as critical, has been found in HDFGroup HDF5 up to 1.14.1-2. Affected by this issue is the function H5T__conv_struct of the component Memmove Call Handler. This manipulation causes use after free. This vulnerability is registered as CVE-2026-34734. The attack needs to be launched locally. No exploit is available. Detailsinfo A vulnerability has been found in HDFGroup HDF5 up to 1.14.1-2 and classified as critical. Affected by this vulnerability is the function H5T__conv_struct of the component Memmove Call Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term. The advisory is shared at github.com. This vulnerability is known as CVE-2026-34734 since 03/30/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/09/2026). There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Database Software Vendor HDFGroup Name HDF5 Version 1.14.1-2 License free Website Product: https://github.com/HDFGroup/hdf5/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.5 VulDB Meta Temp Score: 6.5 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.8 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Use after free CWE: CWE-416 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/30/2026 CVE reserved 04/09/2026 +10 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-34734 (🔒) GCVE (CVE): GCVE-0-2026-34734 GCVE (VulDB): GCVE-100-356665 Entryinfo Created: 04/09/2026 22:04 Changes: 04/09/2026 22:04 (64) Complete: 🔍 Cache ID: 99:393:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸