Is CVE-2026-26200 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-26200, but active exploitation has not been confirmed.

Can CVE-2026-26200 be exploited remotely?

No. CVE-2026-26200 requires local access to exploit.

What is the CVSS score of CVE-2026-26200?

CVE-2026-26200 has a CVSS score of 7.8 (HIGH) and an EPSS exploitation probability of 0.03%.

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HIGHPOC

CVE-2026-26200

CWE-122Published: February 19, 2026· Updated: Feb 20, 2026

7.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-26200 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

A proof-of-concept (PoC) exploit exists for CVE-2026-26200. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.