🛡️ CVE-2026-26200 — hdf5

🟠 CVSS 7.8 — High ⚠️ Exploit Public CWE-122 NVD

7.8

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

HDF5 is software for managing data. Prior to version 1.14.4-2, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems. Real-world exploitability of this issue in terms of remote-code execution is currently unknown. Version 1.14.4-2 fixes the issue.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-26200 is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

CVE-2026-26200 is recorded against 1 package.

hdf5 (fixed in 1.14.4.2)

Timeline and source

Published on 19 February 2026 and last revised on 15 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com
access.redhat.com
bugzilla.redhat.com
security.access.redhat.com

CVE-2026-26200 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity HIGH

CVSS Score 7.8

CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE CWE-122

Public Exploit ⚠️ Yes

Source NVD

Published 2026-02-19

Updated 2026-08-11

Modified 2026-07-15

Fix URL N/A

Affected Packages

Software	From version	Fixed in
hdf5	—	1.14.4.2

References

Exploit, Third Party Advisory https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5p2m-j456-9mr2

https://access.redhat.com/security/cve/CVE-2026-26200

https://bugzilla.redhat.com/show_bug.cgi?id=2441088

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26200.json

🔗 NVD 🔗 Mitre

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Exploit Protection

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