Bug 2511845 (CVE-2026-19024)

Summary: CVE-2026-19024 hdf5: HDF5: Denial of service via malformed dataset
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in HDF5. A local attacker could exploit a vulnerability in the `H5Pget_fill_value` function by providing a specially crafted dataset. This could lead to a denial of service, making the system unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2515360, 2515361    
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Description OSIDB Bzimport 2026-08-05 22:41:16 UTC
NULL pointer dereference in H5Pget_fill_value in HDF5 before 2.1.1 allows attackers to cause a denial of service via a dataset whose version 1 or 2 fill value message has the "defined" flag set together with a negative size field, which is not normalized to the library's "undefined" sentinel and reaches H5T_path_find with a NULL datatype.