PT-2026-61599 · Hdf5 · Hdf5

CVE-2026-26197 · Published 2026-07-20 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

5.9

Medium

Base vector

AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions HDF5 (affected versions not specified)

Description An out-of-bounds read can occur when processing a maliciously corrupted file where an array datatype's full size, number of elements, and element size are inconsistent. Specifically, the library stores the full size in dt->shared->size, the number of elements in dt->shared->u.array.nelem, and the element size in dt->shared->parent->shared->size. If these values do not align (element size * nelem = full size), it triggers the read error. This issue only affects files that have been intentionally altered by a malicious actor and does not occur during regular usage.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-26197

GHSA-GH44-7WPQ-622F

Affected Products

Hdf5

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26197.json · Exploit
• 🔥 https://github.com/HDFGroup/hdf5/security/advisories/GHSA-gh44-7wpq-622f · Exploit
• https://osv.dev/vulnerability/CVE-2026-26197 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26197 · Security Note
• https://twitter.com/infoflowcloud/status/2079240298945777752 · Twitter Post
• https://twitter.com/CVEnew/status/2079238933595001001 · Twitter Post