Bug 2524937

Summary:	CVE-2026-19023 hdf5: HDF5 h5dump tool: Denial of Service via untrusted pointer dereference in variable-length string dataset processing. [fedora-all]
Product:	[Fedora] Fedora	Reporter:	nlevinki <nlevinki>
Component:	hdf5	Assignee:	Orion Poplawski <orion>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	igor.raits, orion, sagitterghostproton.me, scitech-bugs
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["f875222e-4886-42a8-ae27-e3ddedbee146"]}
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Doc Text:		Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2511844

Description nlevinki 2026-08-27 11:39:57 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.1.1 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.